Well, he can always just do a stage 1 D3 setup good for 525 hp, and he may enjoy that as much as I have. I am similar to him and have modded the hell out of many of my vehicles, including the last 05 Vette I had! Same problem rear end couldn't support the power, and then I needed more room than just one passenger! Plus since they leave the torque management , and the car peals out easily the rear should hold up better than the stock vette guys!
Heres my problem....I have easy access to the GMPP parts bin and a dyno. I can go mod crazy for little $'s. I bet a dollar to a donut I could get 650+ RWHP out of this N*, but I feel that Id be back in the same boat....a custom solution to the rear, and I dont want to be there again. So...maybe a pulley, exhaust and tune, grab another 25-50HP and be done with it.