Hi again. Of the ones you've listed, I most use Kontakt 4, Dim Pro, and an older version of GPO.
I have thought about doing what you've done, going "pure 64 bit", but have been too chicken. And I'm a bit too fond of some older 32-bit only VSTs, many of which are no longer under development. Not quite ready to scrap them.
It may be a good idea for me to visit KVR to see if I can find some alternatives for some of my oldies-but-goodies. And if I stopped being lazy, I might find some already contained in Komplete 6 or 7....heh.
I've also been thinking about getting the RealGuit, RealStrat, and RealLP, but having a hard time with the $500 price tag. There is/was a discount, but I had to spend four digits recently on some car maintenance items. Better to fix than to get into a new car payment, yes. But it will take me a bit to recover.
I figure I don't have to feel forced to make any harsh decisions until my next system build, which probably won't happen until 2012 or 2013, unless something breaks sooner...