While normally a budget is extremely helpful in a recommendation thread I think in this more a of a brain storming thread the budget can be part of the discussion. As an example, I explained why I would recommend in the budget I did and also use for myself. Perhaps others can do the same to give SC some talking points to discuss with his friend? I'd also be interested to here the reasoning behind the budget and knives other have chosen.
Fair enough. I'll play along.
I usually have a folder on me + SAK or MT (usually a MT, rarely all 3).
I prefer to keep another folder + fixed + MT in my bag. I don't try to eliminate every possible ounce that I carry. When I buy or carry a folder or MT, weight is not the top priority. A solid, reliable tool is. I won't eliminate a 5 oz folder just because I found a 4 oz folder. The only time I really look at weight is on a fixed blade since those can vary quite a bit.
I'm normally not a fixed blade guy, so I don't keep a lot around, only for camping/hiking and I don't do that as much as I used too (wife isn't a fan of camping and we live in the 'burbs now). I settled on the Ontario rd6 because quite frankly I found a LNIB one here on the exchange for $50 IIRC. There is always the debate of carbon steel vs stainless. Each has pros and cons. I don't know enough about fixed blades to speak to this topic. I just think I found a solid knife at a great price that I don't think needs to be replaced anytime soon. The blade is a little long (I'd rather have a RD5) and that is one reason I added the Mora. Other names you will see a lot of include Kabar/Becker and ESEE. I suggest a 5"+ blade. Again, based on more in input from the forums here and youtube vids on bobs. The Mora includes the firesteel (which can come in handy) and can handle the smaller/finer work at very little weight. I would argue a 5"+ fixed along with a Mora is a great combo.
Folders: I have a Cold Steel Code 4 in the bob. Triad lock has a reputation for be a great lock and its a good size folder at 3.5" with a classic clip point blade. Tad over 4 oz. I do take into account lock type. I would avoid cheaper liner locks and go with a frame, lockback, or other lock.
MT: I had a few Gerber back in the day but I'm a LM fan. I've never had a Vic or SOG. As to which one to get, that is up for debate. Even the basic Windman/Rev is a solid little MT and better then nothing. My LM Wave is probably 5-6 years old.
I also recommend a good size pack (especially if you are talking 72 hours). My first pack was the LAPolice gear 3 day pack at 2590 cubic inches. Surprisingly sturdy pack for $30. Currently using a Rush 72. Tad bit bigger and better quality.
I know some folks like to poke fun at lapolicegear, but I have owned the Bob, 3 day pack, and operator pack. They are easily my recommendations for budget backpacks. They have held up suprisingly well over the years. I still use a Bob as a med kit.