My main ride is a Crosscheck. And like Raiyn said, it's versatile enough to be nearly anything to anybody. This is especially true because it's generous clearances and semi-horizontal rear dropouts allow it to run just about any drive train you wanna try. So if you find you didn't quite nail the spec' the first time out you can reconfigure it till your hearts content.

I first built up my Crosscheck commuter/all-arounder with a Sram 7 speed hub. (Yea, I'd heard they were heavy, but I had to go find out for myself!) Once I got tired of lugging that around, I modified it into a single speed. When I wanted just a bit more I made it a 2 speed by fitting 2 rings up front with a Paul's Melvin tensioner and a cheap front derailleur. I've also run it with a single ring up front and an 8 speed cassette in the rear with a cheap twist shifter. Recently I broke the spindle of my bottom bracket and the spare I had on hand was only wide enough to support the single speed set-up. Thats OK. It'll do fine for a while.

If I'd bought just about any other frame - say, a road frame with fixed rear dropouts that won't take a tire bigger than a 23 - I would've had to either sell it if I wanted to change much, or just settle. Instead I can make it anything I want.

I could go on. But you get the idea.

DanO