Yeah I'm 19 and I've really only got one car.. It's worth like $1,000!
I really don't like 350z 's that much. A while back there was a lightly modded one at my dads shop and I got to go on the test drive, my dad said is is fast, not really impressive or outstanding, and the handling isn't really that great.
I've driven like 3 different model 300zx's and they all steer "heavy", which is what my dad said the 350 was like. I would invest you money in something better... Get an Evo or a WRX

Or if you want a decent daily driver maybe look into a used Volvo (There's some very nice 90's model 850 Turbos out there). If you have the money get a Volvo 850 T5-R

They are sweet.