Like the others it is so hard to say. There are so many that I really like. If I had to choose a favorite, thouugh, I would probably choose Dodge. They have a vehicle that will satisfy just about every one of my automotive desires.

The Viper GTS being my favorite. The Ram is awesome for rallies and some road races. The Neon is a great handling little car. The Viper (SRT and GTS) will hang with the best of them. The Team Oreca race car handles great. The muscle cars are sweet.
A close second would probably be Chevy. What can I say? The Corvette is an swesome handling car. I couldn't believe how well it handled the first time I drove it. The C5R race car also handles very well. The Silverado SSR concept is one cool truck. I love driving it. I think Chevy's greatest strength is its selection of muscle cars. All sorts of Corvettes, Camaros, and the legendary Chevelle.
Next, I would say Ford. They have a nice selection of vehicles. The '05 Mustang handles well and sounds great. Can't complain about the looks, either. The Lightning is quick and agile. The GT is where it's at, though. That is a definition of a supercar. Incredible power, speed, and handling. It looks awesome. I just wish PD would have included more Ford muscle cars.