looks like you've already figured out the wise choice.
fuck rims, any muppet can buy rims and stick em on a car, doesn't make the car they're attached to any better or worse, so they shouldn't even matter in the decision makin process.
buy the S15.
95 GTR's are only worth about 22k to 24k max, esp a stock one, anyone who argues otherwise should get their head checked and prepare for a swift kick to the nuts.