oh yeah, i think rims are the first thing you should get.... get 'em chrome.... and the size of rims you buy should be at least 1 size larger than the stock wheels....
i'm finna go nuts when i git mines... 20 inch rims, carve a sunroof out the top, 3 video monitors (passenger vanity mirror, steering wheel, and one monitor for the backseat), sony minidisc deck, fully customized trunk with 2 "12 eclipse subs and an alpine amp for each sub.... amongst other things