'Is the 350Z for me?'
No idea, that's always going to be down to you yourself.
As said, you need to go test drive one your self. EVERYONE has their own driving styles, one person will love how the Z drives however another may just hate it!
I know there is someone on the forum who sold there Z shortly after having it due to seat issue (Not right for his back)
Just don't expect this car to be the car that will 'win every race'
Another note - unless you want to throw £10k at it, you won't get a whole lot more ponies out of it.
Hope this helps.