I'm a user and a collector. For the user side, I'm an admitted steel and design snob. I rotate the EDC's to stay sharp, but don't carry anything, generally, worse than ATS-34. Life is too short to carry cheap knives, or that's my excuse/rationalization for my heavy collecting habit.
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I have focused more on folders over the past few years, since the expensive fixed blades that are safequeens on the collection side don't provide me as much enjoyment as the nice folders that I rotate through my EDC activities... i.e. I choose to carry and use some folders that are interesting to me. I have a short attention span, and demand high quality entertainment.
In the folder realm, when carrying for use that is unlikely to become pressed into defense mode (I orient my life to stay out of bad parts of Houston and the Golden Triangle, but still, Houston is a typical big city), I rotate through a big variety of Terzuola, RJ Martin, Chris Reeve, JW Smith, David Broadwell, Larry Chew, ZT, Hinderer, Reese Weiland, Microtech stuff, and a Lochsa.
When I am carrying with a bent towards potential defensive purposes, it's a Reese Weiland CQC8-styled folder on steroids, or a production version of CQC8's, or an RJ Q36 or Devastator... and if I get stuck in a sport coat / suit coat, a Bud Nealy Pesh Kabz carried upside down in one of his nifty sheaths that clips to the inside pocket of a sport coat. Black sheath and dark handle, super thin, it hardly shows if I open my jacket for a second.
When I'm carrying to work around the house or for other outdoor use, it's a couple Military's (M4, S90V) or ParaMilitary's (S30V, S90V) lately, but used to be a group of Benchmades (800, 812, McHenry Williams Axis, various Spydies, etc) I still own.
For fixed blade users, it's mostly something out of the Dozier stable... or Phil Wilson hunter. I plan to get more Phil Wilson's on order.
For bedside defense knife, right next to a .45acp or an 870 pump, I have a couple fixed blades ... a CRK/Harsey Neil Roberts at the moment in my apartment, and in the house it's a fancy recurve by a guy named Bona who does work on par with Siska but is a relative unknown.
In the car, I have a cheapie CRKT Polkowski design that has a sharp point and a great grip, and partial serrations just to encourage any asshole who sticks his hand through my window to back away... while I grab a firearm. I live in Texas, and am glad to work within the Texas laws.
I have safe queens... fixed and folders...lots of makers... I can't emphasize the peace of mind my bigass Liberty Safe (with some customized lock features) has brought to me since I swallowed hard and ponied up the monies. If you haven't invested in a good safe, keep that in mind for the future. Theft is the #1 risk, followed by keeping things out of kids hands, followed by fire. I'm preaching a bit, but I think it's important.