It depends on if youre going to power shift it or not. I wouldnt worry about the power though as many people run them with boosted motors. Im not sure there really was a best year though.
If you plan on drag racing I suggest you look into a t56.
I'd look for the later (03/04) versions. They have a steeper OD. It'll knock a couple hundred RPM off on the freeway so you can run slightly steeper gears to help in the corners.
cool where i'm buying the engine they have one, is there a certain Tag number i need to look for?
6 months later.
I am undecided on the topic as well. I will run the t45 until it blows but High rpm shifting capabilities isnt what the 3650 is known for and that worries me. Also they are slowly discontinuing parts for it. The next option is a t56 but those arent cheap .... there seems to be no in between. The TKO option is just as expensive as a t56.
What did you end up deciding?