weight is only an issue if you run any rims other than volk's.
275/35 r18's are the shezz nett. my only regret is that i probably should have bought 295's or 305's for my 18x10's. on 18x9.5's...the 275 is perfect. that's not saying 275's don't work on a 10" rim, but it is about the narrowest i would run.
tire weight will vary by brand...but i can't recommend anything but the bridgestone potenza re-960 as's that i have on my car. suckers are damn quiet and grip like no tomorrow.