thanks for all the responses, guys. right now i think the bikes at the top of my list are

-soma double cross (preferably built up with 105)
-kona jake the snake (or possibly kona jake)
-jamis nova (haven't heard too much about this, any opinions?)
-specialized tricross sport or comp

of course, i'm flexible, because i'm trying to buy used. IMHO, as i've discovered after working at a bike shop for a long time, you get so much more for your money. but finding a 47-49 cm used cross bike is tough! all of the responses have been so helpful--thanks so much. i'll keep reading for more suggestions...