hmmmm, problem is its an unknown. i bought one two years back for £3000, after i realised that the insurance for me at the time (i was 23) was ridiculously cheap.
And to be fair, while it was working, it was an awesome, awesome car. However, in the 6 months that i owned it, it cost me a lot of money - first were steering bushes issues (£200) then the clutch went (£600) then the turbo oil return pipe replacing, then the new clutch started slipping, then just about my 24th birthday it failed on mot for rust which i thought i checked (£600). Also at some point while it was in a garage they noticed the previous owner had stuck a nail through an intercooler when fitting a front bumper, so needed a new intercooler. Oh also the electric fans stopped working, so had huge overheating problems, so the original viscous ones went back in (£250)
Then once id got all this working and the car was how i wanted it, i had the boost turned up from 9 to 13psi (previous owner had already fitted decat exhaust, induction kit, and larger intercoolers) but then after two months with approx 330bhp, a conrod snapped, and flooded the engine with coolant. Had the option of either source a replacement engine (£1500) or scrap the car and get some money back (got £1200 back from parts) in the end i was getting tired and skint, so saved up for a 350z instead.
When it was working properly, it was an epic, awesome, awesome, epic, awesome car! When you put your foot down and the roar of the engine and watching the boost gauge spin round to 13psi and all hell breaks loose... amazing! and when you catch the reflection of yourself in a shop window, driving arguably one of the best looking cars, you will be a happy man!
but definitely know what you're getting into - after all, its a 20 year old car now, and it was technically very advanced when it came out - twin turbo, twin intercooled, rear wheel steering, cruise control, aircon, the works. all of which can go wrong. if you do take the risk, check everything very very carefully, go through the service history with a fine toothcombe and dont accept any absences. personally i wouldnt risk it, a newer 350z is just as quick and considerably less to go wrong - admittedly it doesnt have the kick of twin turbos though
if you do go for it, best of luck to you!