just strolling around the forums and decided to chim in, a Twin turbo 350Z with the stock internals will make around 350whp. kinda little whp if you ask me for investing almost 8K for parts and labor.
the stock Big 16G on the EVO 8 will make 350 all whp and run mid to low 12's. a 350Z making 350whp only to the rear wheels will not stand a chance from a stop and will be about the same as it on the top end.
looks are subjective, i love hte way the Z looks, but i also like the EVO for what it is. you can get the EVO to be much much faster for a fraction of hte price.
since money is not an issue, then twin turbo the Z, it'll be different, and rare.