i've seen those 97-99 style bumpers on ebay. they look okay, primed and such. might not be a bad idea.
18's are the way to go, not too big not too small. becafeful if you buy a cheap carbon fiber hook it might not fit oem. also if you get black projector head lights, make sure you get the 97-99 ones so it will fit the bumper. and get black altezas, that would look good.
www.carbonwerks.com has a lot of carbon fiber peices also. a middle breaklight peice, and a rear trunk cover that i think look nice if thats what you're going for.