I would like to support Buck, but find the price not in range of the materials in most offerings.
Cold Steel- like them, mostly buying used to decrease price, I've had good luck with customer service- unlike others. Their advertising doesn't bother me. Great for tomahawk fans, they offer a wide range of products to hit most aspects of the hobby. Owner is very proud/boastful/blowhard- depending on opinion
Spyderco- great designs, great diversity, solid ownership who listens to customers. Downside is prices are getting higher than some customs I've bought, plus sprint runs seem to be bought by people looking for profit rather than users, so most are not on my radar any more. I second the Native love, my G10/abalone version glows green under black light!
Kershaw- much the same as Spyderco, prices seem a bit better.
Bark River Knife and Tool- great diversity of knives produced, great selection of handle material choices. In my experience owning 5- shoddy QC, and I was disgusted at their customer service/warranty I experienced. Long wait between runs of certain models. I cannot support them further, the owner IMO epitomizes the last word in their name.
Columbia River Knife & Tool- good company to start collecting with IMO. Diverse designs, good value. Not high end steel, but solid working knives. Quality dipped early 2000's but seems to be back on track. I own more CRKT knives than any other company but have never bought one- my wife banned me from buying them so she knew which ones she had gotten me already!
Benchmade- higher end comparable with Spyderco/Kershaw. Some complaints of QC and customer service issues. Price and designs are moving them away from my likes. Only way to try axis lock, which I like.
Chris Reeve Knives- high value, consistent production. The be all end all for some, boring and overpriced for others. I like mine, won't get rid of it but don't drink the Kool-Aid either. My recommendation is to wait until you know more about the knife you like and dislike before trying them out.
Swiss army (Victorinox/Wegner): a staple knife company- everybody should get a few. Most consistent production in the world IMO, especially when taking volume of production into account. One of the best values in knifedom
Mora- great user knives at great prices. Another classic, a bit boring perhaps, but very functional and comfortable.
Opinel- see Mora, but folder. Watch out if in very humid conditions, swelling of handle material may hinder opening the blade.
Strider- not for me, "tactical" marketing, high prices, variable quality. One owners past history is an issue to many.
Case- a standard of American slipjoints. Massive range of products, long history. I've had issues with quality, customer service did not ever return my emails about issues, will not ever buy new again as a result. I do not like their selection of stag (antler) used, quality is too low for me. Heard some quality of construction issues have been resolved. Many models geared toward collectors vs users.
Great Eastern Cutlery/Tidioute/Northfield- my choice for slipjoints new. Each "brand" of the company offers similar knives with different treatments. Great diverse line that keeps growing, many handle choices, newer company that has really taken a corner of the slipjoint market. Some models can be difficult to open, have heard good thing when these models are returned for repair.
Ontario- wont deal with them due to their past dealings with other makers. Good machetes, decent folders/fixed blades in my experience. Make Queen knives slipjoints- horrid, horrid finishing on the blades is often reminiscent of butter knives requiring great amounts of reprofiling to get them to cut.
Boker- German traditional slipjoints with long history, modern folders out of my price range. Some QC issues, good products overall.
Sog- generally seen as overpriced, lower QC than should be, I believe had issues concerning design copying of other companies knives. Not on my radar.
Ka-bar- good work knives, moderate price, traditional military fixed blades.
Mcusta- a knife I would love to try. Nice looking designs, heard nothing negative about fit and finish, have never seen one to hold. Approaching boutique status IMO.
William Henry- expensive, top notch materials with more fanciful designs. My wife confiscated mine when it arrived, as I expected her to! Top price for manufactured knives.
Condor- budget line of outdoor work knives. Somewhat variable quality but from all accounts great working knives. I only have a solid steel neck knife of theirs so can't comment beyond they seem to listen to customer feedback as a newer company.
Of course these are just my opinions gathered from using the knives and taking stock of opinions presented here. Some will agree, others won't but I tried to give a fair impression.
I would recommend getting a Mora, opinel, SAK for sure. If you are into choppers grab a Cold Steel machete/hawk, or Ontario machete, or Condor machete. For slipjoints look at GEC and case (there are others), and for modern clipped folders (I don't use the word tactical) try out CRKT/Kershaw/Spyderco- my suggestion is in that order. For fixed blades look at Spyderco/BRKT/Ontario/Ka-bar.
For vendors I would avoid direct from factory. I've used Collectorknives.net (won't ship internationally any more), new graham knives and knivesshipfree. The owner of bf is owner of onestopknifeshop, so could try him out as well. Honestly most of my new knives come off of the bf exchange- a bit of risk but great deals to be found.
I just realized I'm not sure why you are getting into knives. I collect knives for diversity and to use, so my take will be different than somebody conscerned with pretty and resale value (although I like attractive users). Good luck and happy knife collecting.
Oh, and wait until you get into customs......