I bought a 32 GTR for this exact purpose about 10 years ago and have been having a miserable time of it. I have taken it around circuits on track days and it hasnt been able to handle everything with ease. Then on the weekends or days I'm off work it sits in the shed unloved and it has been a pita the whole time. In my experience (others may disagree), if there is a part on the car you need fixed/replaced/repaired (And there will be), it can be impossible to get the original bits which are rubbish anyway, but if you're upgrading those bits with aftermarket toys, then it gets much more expensive than any other car you modify. The 32's are getting quite old now, so bushes, steering/suspension and everything else etc are all starting to get well worn, so they are pretty much a definite expense if you're going to take it to the track etc, but like I said, you'd probably do the same for any other car you want to mod as well.
So, in summary if you want a fun weekend car dont get a GTR. They arent particularly fun to drive. They are expensive to campaign and not particularly robust in a few critical areas. They are now old and finding a good one is alot of work. There are alot of them about which means you will always be outdone by someone with a bazillion horsepower version of the same thing you have. If you modify them sufficiently to work on a track well then they arent any fun on the road.
I would go look for something a little different and cheaper.