I bought a 2007 Maserati Quattroporte from these guys using Cars.com. The price was one of the best and most reasonable around, the car was in extremely... excellent condition and dealing with these guys was great. I spoke directly with the owner of the company and he was super nice and gave me his personal cell phone number. I called whenever I had any questions. He went above and beyond. His wife handled all the paper work, was super nice and helped me get all this done online and over the phone. She even went the extra mile putting the screws to the shipping company when they said they were gonna be late. Buying a car online can be scary but if you get to deal with great folks like these it really makes it a lot better.
Buying a car isn't the most enjoyable thing since most dealerships hound you while your on the lot and "trail" you. They let me look around with no pressure.