I have a 300zx and my friend has a 3000gt and what i have noticed is 3000gt aftermarket parts are alot cheaper than the 300zx. Stock i would beat him street start but it was very hard to keep up with him off the line. Also it was very easy for him to raise his boost and get into low 12s while 300zx need ecu upgrades and such to go any further. Reliability wise they are both sports cars and when u upgrade something is bound to happen to any car. They do have problems with the transmission (friend has gone through 2). In the end I would still take the Z cuz driving awd cars suck... feels same as a front wheel drive car. Hope this helps