if I could rock kreitlers, I would. they feel nice and solid. even the smaller drums are nice to ride, with their little step-up platform.

currently I have a set of performance brand rollers, I think they are called the travel-trac. think they retail for about 100 bucks.
aluminum drums, folding for e-z storage, smooth, not too loud, and lots of fun to ride. I really felt my positioning and riding smooth out after using them last winter.

Rollers are worth it. Just....get a walkman or something for sessions or you'll go insane!
get a crew together on mulitple rollers and it can be even more fun. we had a ball last year with these things.

I'm also surprised no one brought up R*A*S*H yet!