$15,000 budget on a used car. What should we buy?

We have been looking around for a new car to replace a 95 Toyota Corolla. I will probably be sharing this car with my dad for now, along with a 2000 infiniti g20 which we both like. We started looking at Camrys but we found a 2004 Infiniti i35 with 50k miles for 14k, seems like a very good deal. .any thoughts? I wanted to look at 02-03 3-series BMWs but my dad doesnt want a BMW. Audi's seem a little out of our price range. any thoughts?