350Z or IS 300 ???

Simply put, I'll be getting a car soon I and can't decide wether I want a Lexus IS 300 or a Nissan 350Z. The Z is wayyyy better stock and looks sweet. The IS 300 is quite a bit worse stock but has massive potential for power with its enginge, and of course it's a Lexus so nice quality. I really need to know if the Z's engine can get to around 500 bhp... without a turbo or super charger. I know thats a lot of ponies but the IS 300's engine can do it so, I was wondering. Thanks for any input you may have.

I can't really help you with the performance part because I don't know the specs of those cars so I wont lie but I know that I prefer the styling of the IS300/Altezza more than the 350Z which I think is an amazing car too. Plus, if you're going for a daily driver an IS300 might be a better choice because it is a lexus after all and the Z is more of a roadster.