Glad to see there's people that can use logic on this board.
F1, I agree with your comments. But you have to remember that the Acura trannies have to handle less torque and are direct-linkage (vs cable for the Boxster due to location). Same with the S2K and Miata, both of which have awesome shifting feel. Get the B&M short shift. I will help immensely with getting rid of the the loose, ropey feel.
Also, I did a quick calculation with the Boxster's weight/torque/transmission ratio vs the 911's weight/torque/transmission ratio. For S owners, if you install the 2.7L shorter rear end ratio then you will be within 2% of the 996. If you install the 2.5L rear end ratio you will be right at the 996 numbers. Base 2.7L owners can install the 2.5L rear for a little more zip.
I'm not sure if the rear gear is swapable although I'm thinking they should be. Anybody know for sure? Paging Toolpants...
It would be interesting to see someone do it if the parts are interchangeable (especially S with Base).