I just installed the 235/40-18 & 275/35-19 Bridgestone S-04s on the SRT6 only because I couldn't pass on the deal I got. Have the same size tires on my Limited but they're General G-Maxs. The Generals actually look beefier on the rear then the Bridgestones. The 285s would probably be a better bet with the Bridges. No need to go wider up front or you'll definitely get rubbing. I would have rather installed the G-Max as they have been fantastic on the Limited. Over 40,000 miles and still going strong. Twice the mileage of any other make I've run, and still quiet and sticky w/ plenty of tread left.
Also, no spacers and not lowered...all stock.