Buy the SRT it is only a tad more expensive and the performance difference is HUGE... it only comes in autostick so that is the way to go
as someone already mentioned its the best of both worlds and the crossfire was never ment to be a "sports car" it is more of a touring car.. and the auto is perfect for that reason, but as you mentioned if you find that auto is boring or that you already have another car with auto then by all means get the standard with manual
my 2 cents
-Sidez