I currently own three bikes, a 2007 Fuji Cross Pro cyclocross bike which I ride at school (on the East Coast), a 2004 Fuji Panic dirt-jump bike which I ride in San Francisco, and a 2004 Zoo! Pitbull trials bike which also lives in San Francisco.
2007 Fuji Cross Pro
After breaking my third road bike at school, I bought this heavily discounted from a local shop for around $1000. More money than I ever wanted to spend on a bike, but it rides quite nice. The front brake does tend to chatter some, which sucks, but aside from that, it's very, very fast, comfortable, and quite durable for what is essentially a road bike.
Edit, Oct 2011, this bike has changed quite a bit: The stock Fuji fork failed at the epoxy joint between the carbon fork crown and the aluminum steer tube (in June 2010). The braking surfaces on the wheels were also worn out, so I replaced the wheel-set, as well. The front brake is now a disc (Avid BB7R). The wheelset was switched to Vuelta, until the rear hub died (cracked races on the internal cassette bearings, around June 2011).
The rear wheel was switched to Mavic. The fork was a bike Nashbar disc compatible carbon cross fork. In early September 2011, while pulling out of a stop-sign, the aluminum steer tube snapped in half where the stem meets the spacer stack. That was the end of aluminum road forks for me. The current bike is:
Mavic rear wheel (the cheapest I could get with a 3-yr warranty) Vuelta Front Wheel Salsa steel disc brake fork Avid BB7R front brake, on a 160mm G2 rotor Avid rear canti brake 2007 Shimano Ultegra shifters/brake levers 2007 Dura-Ace rear derailleur 105 front derailleur FSA Gossamer crankset Wellgo DH pedals (platform one side, SPD on the other) Ritchey stem, bars
Hopefully this won't break anytime soon, but somehow I have my doubts.
2005 Fuji Panic
This has been my commuter bike for the past five or so years, while also providing occasional fun forays into offroading, dirt jumping, and basic trials. This bike taught me to trackstand. The rear wheel has taken a beating, with the current rhynolite rim dented after a failed jump up a 3-set. Whoops.
This bike certainly isn't fast, but it changes potholes from painful and scary to easy and fun. For a pure city bike, that's worth it to me.
Oct 2011 update: I spent 2 weeks riding this bike while waiting for a replacement rear wheel for my road bike. It was awesome, being able to jump stuff on my commute. But then the bottom bracket snapped while pulling out of a light. This bike is now on semi-permanent retirement.
2004 Zoo! Pitbull
I've had this bike for less than a month, after deciding to begin learning trials for real. With a background in unicycle trials, I hoped the learning curve wouldn't be so nasty, but so far not so lucky. Still, the bike is tons of fun to ride, and far beefier and more responsive than my Fuji panic, while also being >10lbs lighter.
In case you're wondering, the bike only has 1 speed and no provision for attaching a seat. Other quirks are unusually wide handlebars, a hydraulic rim brake in back, and relatively wide tires (2.5" in back). This bike is not for any sort of distance riding (it's like a unicycle that can coast down hill), but is optimized for going over obstacles.
The specs are: '04 Zoo! Pitbull frame Chris King Headset Thomson X4 stem Zoo! 31.8mm handlebar XTR front brake lever Avid BB7 front disc brake Magura HS33 rear rim brake / yellow Plazmatic pads Echo brake booster Middleburn RS7 trials crank / 22t hardcoat ring Wellgo B25 pedals Front Hope hub / Sun Rhyno Lite rim / Panaracer Fire XC Pro 2.1 Rear Chris King HD axle w/ fun bolts / Alex DX32 rim / Michelin Comp 2.5 DH King Cog 19t Rohloff chain tensioner
Oct 2011 Update: No component changes. Trials is still super hard, and this bike makes a terrible backup for when my road bike is broken.