I see you've priced some things. I don't know your financial situation, but going from a supercharger to a turbo is a lot of extra expense and hassle. I'd say pick 1 and run that way.
SOHO now has their 2.5 kit fitting with Z1 headers if you went that route vs the PPE set.
Fast Intentions is THE TT kit on the market. If you want a single, BP or SOHO.
As for cams, Jim Wolf has a C1 and C2 set. I've been running the C2s for a couple years. They really wake the car up on the top end.
Jim Wolf Cam testing for the VQ37VHR -- Results inside!
Jun also makes cams for the VHR, but those are your only options.