Congrats on jumping in on your project! I'd definitely do a turbo rebuild if you have everything apart...I did it and it's easy and not very expensive with some Melett CHRAs. Also, I totally agree on the TotalTechnik video...saved me a lot of time and headache with some of the simple tricks that matter if you haven't pulled the RS6 motor before. Good luck on getting that stud out...it was one on my biggest fears on my disassembly, but I got all of mine out ok.

Keep us posted on your progress!