I can tell you that most people on here don't find lighter wheels without shelling out some mad cash. The wheels I have, tsw nurburgrings, are the lightest I could find under $2k at 18.5 lbs. I also moved to a 245/40-18 tire a potenza 970, the grip is far better overall. If there is any difference in acceleration from weight, its negligible. And will be until you do something major to lose weight.