Hello Buying a used car will give some problems in the long run if you get a car with HIGH Miles like 100,000+! Get a car with 10,000 to 75,000 miles and don't get a cheap base model like a Nissan Altima 2.5 S. Get a Alitma SL or SE or Spec R either coupe or sedan.
If I was you, get a Honda Civic,Kia,Hyundai,Mazda,Mini,Mitsubishi, Scion, Subaru,Suzuki, VW or Any of Toyota models!
Try to VOLD ALL amercian auto maker. You spend more to fix them then over sea models!!!!
2010 Nissan Juke SL with 15,000 miles on it with 4wd if new will cost you at lease $22,000 but he got it for much less. He got it for a nice $12,000
2009 Nissan Cube 1.8 S with Krom Edition (supper charger model) with only 35,000 miles, Front wheel drive. If you had it new, It will cost you $20,000. She got it used for $8,000.
2000 Infiniti (Nissan big brother) I30 Touring with 150,000 and he got it for supper cheap $2,500 HOWEVER he calls it a LEMON! He droped over $15,000 into it in which I found it DUMB!
I hope I help you!