2001 infiniti or a 2001 audi? Uh, honestly Lexus and Infiniti didnt start stepping their game up until the last few years, so overall the Audi would probably be better.
But then maintenaince and just overall dependability the Infiniti might be a better bet. So its really a toss up, why not just save up get a diff car? i'm looking at 04-05 infiniti g35's only like 12-13k.