check driven concepts and talk to cody. they can usually get you whatever you want and they have always given me good prices.
or check out some of the vendors on honda-tech. i have had good luck with StreetRays.com. they have good stuff and fair prices. i have ordered a ton of stuff from them and never had a problem, plus they will usually cut me a break on prices or upgrade my shipping for free since i have ordered so much from them.
as far as the differences in suspension, i know they revised a few things to make the car handle even better, but im not sure of the specifics.