I rode a friend scott sub45 - large. It fit well, loved the disc brakes...shifted smoothly. What size is that bike, so I can gauge what I should buy? I cannot really find proper sizes on it (I guess 56cm?)

I was wondering, new/used, what could I get for around $300-$600? I'd really love a black/white bike, but that's not needed.

I found REI has a new 2011 sub20 for $719, but that's a bit above my range.

I love the look of the Cannondale Bad Boy Bike - 2011, but how does it compare? Is there a different model I should look at for cannondale? Something to stay away from?