It depends how radical you plan to take it.
Will this be a bolton only car?
If you plan to do the basics with spray, I'd say a Z06. If you plan to TT/Supercharge it later, I would probably go with a GS (if it's just the Targa you want).
The LS7 can be a great FI car but if you are going all out, I'd probably still go with the GS unless you have $100k to blow away.
The GS looks exactly the same as a Z06, same fenders and everything....