Does it have to be a luxury car?

The Lexus IS could be appealing, except it is small inside. Really small.

The three other Germans are all decent cars, but they don't really qualify under the "low cheap maintenance" part. Then again, having owned a Lexus before, I will say that Lexus maintenance, when something breaks, is just as, if not more expensive than BMW. Don't let folks make you think just because it's a dressed up Toyota, that parts are cheap.

Given the way the economy is, you could get a lightly used or new 4-door sedan that isn't a luxury brand but has all the features you need. GM has some decent cars of late and their reliability and quality has greatly improved. Plus, they will probably give you $7500 off the MSRP and their first-born child to get you to buy one.