You will find that most of what SD offers will work fine with Win7. I'm running the 64 bit version with:
SkinStudio 7 Pro (never used, lack of talent on my part )
There are other apps that work but I don't have installed.
The value of buying all this as a package is obvious. You save big bucks! Plus Impulse makes it so easy to update or reinstall it all when needed, it's a no-brainer.
Also using but not part of ODNT: CursorFX Plus and OD Plus 2.0 which are also well worth trying out. Both have free and paid versions.