welcome aboard
IMHO 17's is that max you want to go, there are corollas out there with 18's on them, while i personally don't like them others may.
probably the largest tire width you would want to go with is 205(i run 205's without a problem), and i do believe 215's are a tight squeeze(some correct me if I'm wrong)
my recommendation for suspension is, new springs, shocks, bushes(rubber or polyurethane), and maybe a front and rear swaybar as well. just depends on how much money you have/want to spend.
heres a link to my seca >>AE93 SX Seca
then if you want more info there is always Twincam.org
JiP, i'll really confuse you then :hmm: since the ae9x chassis goes from ae90 - ae96 with variations that include sedans, hatches, liftbacks, coupes and wagons :D