R33 S2 would be my advise.
Try and get something with an airbag also. Not sure how many clean cars you will find around for 12K that haven't been molested.. But i wish you all the success in the world.
Big piece of advise, make sure you get a mechanic to check everything over first. This is coming from someone who is on his 5th skyline now. R33 4-Door, R33 GTR, R34 4-Door, R34, R34GTR - And i had them all checked out execept my 33GTR...which has just cost me 9K (not in engine rebuilds) to fix...all because i thought i knew my sh!t.....
Costly mistake. - But mind you, its now a weapon and has all the goods, no expense spared - Might be up for sale soon if anyone is interested in a GTR, chuck me a PM.
Thanks