Have you looked at the 24 valve engines? 2.8, 3.2 and 3.6s. 280-290 hp with a standard R32 running Emerald or a 280-290hp 12v running 8 psi with either a turbo or supercharger. I know which one I would go for everytime. If you work out the costs involved going the turbo route properly to get the reliability its a no brainer.