17x9 +15 F / 17x10 + 12 R

you'll have to do a decent bit of fender rolling/pulling, but it's not that hard. whatever you do, don't get the wimpy low width/offset ones, you'll regret it down the road. making the 10's fit in the back would look a ton better, not only because of the added with, but the fact that they are the only ones that get the super cool concave face on them (see below). good luck, and just make sure you do lots of research before you buy anything (check zilvia.net and ziptied's wheel fitment threads for examples of what some of the more aggressive fitments on S13's are).

here's what the 10 looks like...


or a decent option that's not quite as aggressive, 17x9 all around...


and wheel fitment threads that you can check out for ideas:
http://www.zilvia.net/f/showthread.php?t=129865
http://www.ziptied.com/forum/viewtop...2af9970c882751