The difference from a loaded RT to SRT is about $6k. Items not available on the RT include the higher output 6.1 the better performance suspension, the brakes, the performance telemetry on the gauges, the 180 mph speedo & I think 20" aluminum (not chrome clad.)

RT offers better mileage, lifetime warrantee, cheaper insurance, potential of more money leftover for tinkering.

It's a personal call.

All 3 models are a good choice for their own benefits - I'm contemplating in addition to my 09 SRT an SE as a for a great looking, good performance, cheap insurance, lifetime warrantee daily driver. For what some are paying for 08 SRTs they could buy an 09 SRT and 09 SE.