I've just seen that bit and thought similar.
The problem is that he wants a car to do everything. The ISF (or even the Camaro he's gone to) are relatively heavy for track cars because they're really road cars. What he should have done is got something like a Caterham for the trackdays (if such a thing exists in the US) and kept a road car.
I've seen a couple of reviews of the Camaro and it seems like it's generally well liked. In the end you buy the car that suits you. Having had a look at the Lexus offering, I'm not sure I'd stick with the brand simply because there isn't currently anything that meets my requirements.
Another interesting video I've seen is Chris Harris comparing the GSF to the M5 (below). While the big 3 German manufacturers seem to be chasing numbers, with the GSF Lexus seem to have gone in a different direction and for road use it seems to be plenty (not that I've driven either).