On E bodies we stay around 26". Usually we go 275 35 18 front and 295 35 18 rear on 18x9 or 9.5 and 18x10 rear.
Perhaps performance-wise that's a good size for the rear, but 26" for the rear of an ebody is far too short for me. If aesthetics are a priority, I'd have to stick with a 28"+ tall tire. It's just too big of a wheel well for that short of a tire. In my humble opinion.
