Ok so now it comes down to a BF FPV vs the FG XR6T, this is a pretty common discussion on fordxr6turbo.com if you are buying one its worth taking the time to sign up.
The BF and FG FPV use the same turbo, its also the same as the B series xr6 turbos. In the FG they switched the xr6 to a slightly smaller turbo which i believe maxes out around 330-340 rwkw give or take. The upside to this is they boost quicker, not that i find that an issue in my 6 speed auto BF xr6t anyway. The FG xr6t also seems to reel off higher figures on the dyno completely stock and I believe some guys are hitting high 12s standard in auto. My uncle has an FG g6et (same engine wise as the FG xr6t) and i think he said it ran up into the mid 200 rwkw range stock, not even retuned.
Either car would really benefit from a small bit of cash spent on a flash tuner + high flow cat + injectors. If theres anything you want to ask feel free to PM me.