I used to have a 350Z
The Evo is better performer than the Z, however is way too ugly for me. I can't stand the idea of a four door sports car. If I had to have the extra doors I personally like the STi better than the Evo.
I was in the market for a Nismo 370z until two months ago. I'm 34yrs old and I wanted more HP than what the Z comes stock. I did the math and in order to get what I wanted I would have to spend around 20k on the Z on top of the car cost.
I ended up buying a brand new 2013 Corvette Gand Sport. This car is a monster out of the box. I love it, I never look back. The Vette is on a hole different level than the Z hands down.
Don't get me wrongthe Nismo Z is a great performer and if I had to chose between the Evo and the Nismo, I would pick the Nismo without hesitation.