Bought my 09 used, and I (stupidly) assumed that all the new sport trimmed hemi rams came with 3:92 and LSD. Man did I feel like an idiot when I realized it was a 3:55 one wheel wonder!
Not only does the traction and take off suck, but I don't even get very good MPG! I've been averaging around 8 MPG around town, and around 12-13 highway!
...I say DEFINATELY go with the 3:92!