RE: RT or SRT
Romeo Tango.
As stated, the RT is a blank canvas, and that is suuuuuper appealing.
Also, in regards to fuel economy....putting premium in the SRTFuelDestroyer would be at least a weekly beatdown on the wallet and the marriage. Seriously, though, the mileage ratings don't even account for the differentiation in fuel cost from regular to premium.
The RT is a pretty darn good value (MSRP pending). Ripe for customizing (not gangsterizing.) I wouldn't dream of customizing an SRT8, it just seems wrong. Immediate disqualifier.