are you getting Win7 with this new computer? and if so, why not 8?
but to your original, what's wrong with a couple of VST folders...put wherever you want them. If I recall, Toontrack doesn't like you moving stuff around, once installed. I've got the sample files on my C drive when I installed EZD loong ago, and there isn't any way to move them. I've got the space as it isn't taking up that much...5-6 gigs or something like that, but it was an error and I don't want to uninstall and do over, as it's working as is.
Hard drives are cheap, and a pile of dedicated drives for stuff seems that way to go to me... and I'd use Cake's system of storage with directing the audio of course, somewhere else. I'm no computer geek for sure, but I'm not sure I'd just leave the .dll files on the C drive.
and it looks like the Junction link magic isn't supported by Win8...so that might make a decision for you too.