I personally would not get anything less than the 3.92. I wish they offered a 4.10 like my 2000 Off-Road Ram had. I am one of the few that get better mileage with those gears. It must be the way I drive. I always figured it got into overdrive sooner. You will definitely want the limited slip if you live anywhere that gets snow. The tow ratings are higher on the 3.92's also.

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'09 Ram 1500 Hemi TRX4 Crew Inferno Red
Bucket seats, sunroof, TorzaTop, hood deflector, Mufflex 14"