its a 4 dr sedan, and im seriously having a hard time deciding on which size to get, what would be the best and does 17 and 18 make much of a difference in size? can I slam my car with 18's or would it rub too much since the tires are wider, cuz right now im slammed on 195/55/15 and it rubs when i turn, but i dont think i'll be able to set my coilovers all the way down with 18's, plus i wont have to, since 18's are bigger, i wouldnt have to drop it much in order for it to tuck the wheel a lil right? please help me guys...

its a 96 by the way