First off, I would only get a rack that supports the bikes from underneath and them well. A rack that clamps onto the frame and lets the bikes swing freely is hard to deal with and it is IMPOSSIBLE to keep the bikes from banging together and destroying the paint or other components.
The swagman will get the job done for not a lot of money. I worked at a bike shop for a while. We carried them and the customers never had any issues. I once saw a swagman with $15k worth of bikes on it! However, if you feel like you are going to use it frequently I would invest in one that might have more features like a Thule or Kuat.:coffeedrink:
I agree for the most part, but will have to disagree about the ability for a rack to keep the bikes separate.
I use an allen rack [ame="http://www.amazon.com/Allen-Deluxe-3-Bike-2-Inch-Receiver/dp/B001M4KXDM/ref=sr_1_1?ie=UTF8&qid=1304776531&sr=8-1"]Amazon.com: Allen Deluxe 3-Bike Hitch Mount Rack (1.25 or 2-Inch Receiver): Sports & Outdoors[/ame]
but use the yakima cradles that strap to the down tube. This system keeps the bikes separate and is relatively inexpensive.