sorry to jump in here, but i have the "old" 4.7 (07 QC) and it is.... slow.
It has adequate torque (i pull absolutely nothing and only load my bed down with the occasional fire wood). it will still beat a ford fusion or those types of cars. but put up against cars/trucks that have any balls, i dont stand a chance after 30 mph. however, with the being said i still love my truck. it cost me $3,000 less than any other dodge with a hemi in the year and mileage and it was a good deal. i bought it used. if you dont do much heavy towing or pulling then i would say try the 4.7. you will save some money (unless you can get a good deal on a 5.7). and with a tuner, im buying one soon, it really will do everything i need my truck to do and look damn good while im at it