the bullitts are about the same weight as the fr500s i personally live the fr500s better , but am currently running stock bullits on the front with 245/45/17 and on the back 10.5 DD bullitts with 315/35/17 and even those arent all too terribly heavy
I came across a chart with info about this exact subject just the other day. If I can find it, I'll post it. It even showed combined weights of different wheel and tire combinations. This source isn't as reliable as the other one I found but maybe it will help.
Just found that info again. It doesn't cover everything but should give you a basic idea of what some different wheel combos might weight. The stock 16x7.5 wheels that most people have are 17.55 lbs. each, and combined wheel tire weight with 225/55/16 tires is 43.5 lbs. By comparison the popular 17x8 Bullitt wheels with 275/40/17 tires are 50 lbs. combined weight.
Ive seen alot of charts on wheel weights and what not. Pretty much I can tell you since i have 18x9/10 FR500s and for the track I use a set of the 3-6 15'' stock V6 wheels. There is a HUGE weight difference. Even with my larger drag radials on the rear ones.
But if you want lightweigh wheels, go get your some drag racing wheels.
Draglights or Dragstars are both sexy and light on the 15x8 options.