Which Car is the right one for me?

Alright so Here's what I'm looking for. USED. under $14,000. I am looking for a classy sedan that has the power when needed to avoid some morons that are out there on the road. I lately have been looking at Bmw 3 and 5 series, absolutely would hands down purchase one however, I want to think long term with maintenance costs being somewhat reasonable. I would appreciate all input. I've been through google, craigslist, ebay, and autotrader. I'm out of ideas as to where and what to look for. Remember. Class... with power. Thank you :)