I would buy the GTR and with the extra money get the Switzer P800 kit and beat everything.
It makes short work of a ZR1. Although the ZR1 looks 10x better.
YouTube - (HD) Corvette ZR1 vs Nissan GTR Switzer P800
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04.5 Z33 412/412 Single Turbo. KABOOM!
New car, 2004 YJ GTO - Forged TSP LQ9 370 - Fast 102/102 - Big Cam - Fasterproms