i think I decided! I will use the N/A Drivetrain until I can source a rear end for a sufficient price, and then I will convert it to FULL TII with an FD Torsen LSD in the back.

Just as an update and a farewell to this car, the engine got torn out and sold, and all the S5 goodies got put in my TII, and she's currently sitting naked at my house, awaiting someone to pick her up and give her a new life...

Here are some pics of the carnage:

http://i151.photobucket.com/albums/s...C/DSCN4980.jpg

http://i151.photobucket.com/albums/s...C/DSCN4981.jpg

http://i151.photobucket.com/albums/s...C/DSCN4984.jpg

http://i151.photobucket.com/albums/s...C/DSCN4986.jpg

http://i151.photobucket.com/albums/s...C/DSCN4985.jpg

http://i151.photobucket.com/albums/s...C/DSCN4989.jpg

http://i151.photobucket.com/albums/s...C/DSCN4990.jpg

http://i151.photobucket.com/albums/s...1/DSCN5112.jpg

http://i151.photobucket.com/albums/s...1/DSCN5121.jpg

http://i151.photobucket.com/albums/s...1/DSCN5122.jpg