Wondering what used car I can get with 21,000?

I'm wondering what best luxury reliable sedan I can get from no earlier than 2007 with a price range of 21,000. I've heard companies like Lexus, Acura, and Infiniti are very reliable in the long run as Japanese cars have that re[utation. Hopefully the car wouldn't have more than 50-60k miles, but most importantly it must be luxury, maybe awd, and RELIABLE. Any help would be appreciated thank you.