They're generally reliable, I have one and drive it daily.
If you extract more power out of 15y.o motor, it's unknown on how long will it last - that being said, in what manner will you drive in '2-3 times a week'
My current GTR is my 3rd GTR I've owned and not one of them have pooped its motor one being 302rwkw, another is 270rwkw and current one is stock for time being.
Just do oil/filter change every 5000km, replace what is broken, etc... On top of that buy healthiest one you can find and fit in your budget.
Midnight Purple 33r, wise choice as I've got one now happy with it!