...please don't start me on the P I T A that is the wide-body kit...
Go checkout a site like bodykits.org if youre not too familiar with the car -- or, if you're into print media, go to barnes & noble or whatever and pick up some import mags to take home and browse through -- or just sit there and page through them -- there's plenty of ads and good references on the sort of thing
personally, i think the simpler styles like the R33 kits are the best match for this particular car - based on it's original early-90s squarish styling - but in the end all that's up to you
..and as for my eBay comment - there are kits and accessories for these cars EVERYWHERE!...