Hi Bernhard!
First of all I have to tell you that I do understand your situation and that you should still keep working with GS3 until the VI is ready for us!
I've been experiencing the SAME problems than you. Except that I could copy the whole library on my pc.
The thing is that if you install VI on a system where GS3 is already there, except some big crashes! So, just install a new operating system. It works way better than before.
I had the same questions than you : how can you expect us (composers) to work with bounce? I can't bounce each instrument one by one to get my memory free! It's absurd! Gigastudio was running as hell for me. Having more and more use of the articulations, I needed more and more memory...more pc then...
THEN I started to think : those guys at vsl know their job! It's impossible to think that they screw it up that much! So (with the help of Paul Steinbauer, thx man!) I started to think in a different way to write music with VI.
I've succeeded to launch 20 VI on 1 computer (I was so happy!!!...what the!) using Vstack. Then I started to write music in a way I couldn't think about when I was using GS : 1 VI = 1 instrument or group.
So I could have the whole articulations I needed for V1, V2, Violas, Cellos, Bass with only 5 VI! That was great! Of course, as I was writing my score I had to load and optimize the memory usage. But believe me, to obtain such result with GS, I would have needed something like 3 (maybe more) midi ports (16 tracks for each). Then, if I felt bad with a line I reseted the VI and change the line....optimize (ok..that takes time).
BUT after all, my pc wasn't strong enough or the VI is not as optimized as it could. I starting to have some electronic glinches when too many notes were played.....so I thought : ok! I'll wait.
I know they are working on dual proc 64 bits and I think I will buy the best configuration they will recommend. Today I'm still working with GS3.
I just hope I won't have to wait too long to use the VI as it should work!