Need some car advice?

Hi everyone. I'm switching jobs and have to purchase a vehicle. I'm currently in an 07 Fusion (co. car) and would like some feedback on the cars I'm looking at. I want to spend at the most 18k and am looking at the following: 03-04 Audi A4, 04 Volvo S40, 03 Acura TL. I'm also considering an 04 Maxima, but can't find one within my price range. I used to have an Accord and Maxima, but really like the first three cars mentioned. However, I'm at a crossroads with all the research I've done regarding their reliability. Can someone please give me some advice/feedback on the Audi, Acura, and Volvo in particular? Your experience with any of these cars and how long I can expect them to run if i buy one with 50k miles or less would be greatly appreciated!!! I was also considering an 03 Infiniti G35, but haven't looked at one. Thanks in advance!