Rota Slipstream: 6.5 or 7 inch?

96 Civic LX.

KYB AGX shocks
H&R sport springs
CTR rear sway
ASR brace

For daily street driving, is there a big difference between 15x6.5 and 7? Weight? Right now I have 17x7 (mistake). Thanks.

I don't see why there would be. Better grip with the 7 with the wider tire. You already know 7's wont rub your wheel wells. The weight gain should be negligible.
Other than that...