Much like Phil said, you will hear many opinions based on personal use here on the forums. At the end of the day, you have to find the one that is right for you, including price, nozzle size, feed (internal mix, external mix, etc.), cleanablity, durability etc.
Personally I use the Iwata Eclispe as my workhorse and it has held up wonderfully over the last 5 or so years. Very durable and easy to clean. I also have the Sotar 20/20 which I used for fine detailed work. While it doesn;t get used much, it has greatly helped with some tough camo schemes.
High on my "want list" but a little out of reach from the affordibilty stand point, is the Harder & Steenbeck Infinity.
From my experience, I'd recomend you take a look at the Iwata Eclipse. Again, this is based on my limited experience and I would also encourage you to weigh this against the comments you will hear from others here about the AB's that they have had success with.