lear4406..
I think youre right in the ballpark with your 0-60 expectations.
The 09 R/Ts with the improved 5.7L 375 hp 6 speed should suffer less parasitic loss than the 5 speed automatics. Im guessing ~ 5.3 - 5.4 0-60 times.
Again, I think times will improve with the 09 6.1L SRTs for the same reason. Im expecting a solid 4.7 from the 6 speed version. THAT oughta snap my head back.