A little about me:
Worked at a hardware store while in school where I got a decent discount on knives, that's where I handled my first quality cutlery. Ended up with a G10 Leek and a composite-blade Leek, a Boker Infinity (later stolen

), a RAT RC4 and an Emerson CQC-7. Ended up only keeping the G10 Leek and RAT RC4 through college, then last year a coworker (member on here) showed me his Manix2 he picked up. I loved the feel (first Spyderco I'd handled). Picked one up and carried it until this March when something snapped inside me. I joined the Spyderco forums, and started buying 2-3 knives a week. Some weeks are slower, but some make me wince.
Right now I'm carrying either the M390 Paramilitary2, a Ritter RSK in M2HS, or the M4 Manix2. Occasionally, I'll switch to the Super Blue Caly 3.5 or ZDP Caly Jr if I need something smaller. Coming home at lunch today to hopefully liberate a ZT0301 from my mailbox. I get most of my pleasure from trying to hunt down discontinued or highly-desired knives I guess, and the rest comes from carrying and using them every day instead of keeping them boxed. If I pick the right ones, resale value doesn't get hurt THAT much. Recently found a Ti Fluted Military as well, but passed that on to a coworker who'd had a preorder going for a while.
I think I'm aiming for a tan or orange RAT Izula next. I'd love to get one with the old triangular logo before they switched to ESEE. To go along with that I'll need either a Sharpmaker or the 302F and UF stones to match my 302M. Most of my blade maintenance was performed with a Lansky diamond set, complimented by a black hard Arkansas stone, yellow and blue stones and a strop. About 3 weeks ago I broke down and bought an Edge Pro/Chosera setup and haven't looked back.