I use the VS-700 with X1 not X2 and can't comment on any differences.
I think the V-Studio is a great package. There is less support, but I really haven't needed any except for getting the Fantom set up. I don't know of a comparable package for the price and nothing that will integrate as well, but, that said, there are a LOT of options out there.
I have the Fantom running in 64-bit (I believe). My comments on Fantom:
1-I thought I would use it a lot more than I do. It has some good sounds but nothing I can't cover with something else I have.
2-It was a real pain to get running - very confusing and required Sweetwater tech supt
3-The documentation on it is about like on any Roland synth, which means unclear.

I love Roland stuff but they have never been good manual-writers.
Big quirk with the Fantom: You can only have one instance running. Not a problem, but if you have a project open that uses the Fantom, and then open another Fantom project at the same time, Sonar locks up and crashes. I often load a second project to look at or copy tracks for a current project, and if I forget about the Fantom thing, I am screwed. Sonar should be smart enough to warn you and let you cancel, or, better yet, just open the project with Fantom grayed out.
There are a few quirks to understanding the input/output choices for the V-Studio in Sonar, but it is not that bad once you get someone to show you how they have arranged things.
My main complaint is that anytime you power off the V-Studio I/O, you lose all your mic pre settings (trim, compression, phantom, etc.). Not that big a deal and maybe other manufacturers have the same problem, but it is annoying. You need to note your settings somewhere (like taking a screen print).