C210's are shit. they're old, they're full of rust, they sell for the same amount as a newer R31, they're not a collectors item unless you get a special edition, you can't convert them to a "GTR" spec like a C10 or C110, they handle like a car from the 70's and look like ass.
You'd be a fool to get one unless you're really really into em. You'll notice that the guys who own em keep em in mint condition and spend a fortune on em, cos they love that model. If you're just getting one as a cheapie, a first car, or cos you want a slice of nostalgia, bring me your money and I'll defecate on it and set fire to it, so I can save you the trouble of finding out what a waste it is a year down the track.