After a lot of looking at towables, we chose a Kia Soul. It's a great little car, with a surprizing amount of interior room. Cheap on gas too! Main reasons for our choice:
Light weight: about 2,200 lbs - don't even know it's there most of the time.
Easy to put a tow plate on: we use a Demco system and I was able to install the tow plate myself with basic tools.
Great value for money: the Soul has all the options at a low price and long warranty.
The only disadvantage (if you see it that way) is that you must buy the manual transmission model - just put in Neutral, key on ACC, and go.
For braking we chose the Blue Ox Patriot system. Installs in seconds with no modifications to the car.
Happy Trails,
Dan