I love my Iwatas. I have an HP-B and and an Eclipse CS. I've used a Paasche VSR90 and an old aztek, and I've found the Iwatas to be far superior. Better atomization, more consistent paintflow with fewer problems, and much easier to keep clean. Wouldn't trade 'em for any brushes in the world (well, maybe a custom micron). Add the pre-set handle and a detail crown, and the Eclipse CS would be a great brush to learn with and grow into. Very versatile and easy to maintain.
All that said, there are many great airbrushes, and people swear by particular brands/models. Badger, Paasche, Iwata, and others make great airbrushes. So, instead of focusing on a specific brand, think about the performance characteristics you want: Do you need/want the ability to spray very tight lines and patterns? If so, look for a double action model with a needle/nozzle size of .35 or less. Or, do you just want a brush to learn the basics? In that case, a single action brush with a needle/nozzle size of .5 would suffice. How important is ease of cleaning to you? If that rates highly, then I would suggest a gravity feed airbrush. Conversely, how important is the ability to 'hot-swap,' or switch colors quickly? If that is a concern, a suction feed (bottle), or a side feed, may be better options for you. Lots of options, but I recommend thinking about what you want in terms of performance/characteristics before selecting a brand. After you figure that out, think about what you want to spend and go from there. Personally, I prefer a gravity feed brush because of the ease of cleaning/maintenance and the fact that I can dial down the airpressure more effectively than with suction or side feeds. And I've been impressed with Iwatas because they seem to be built to higher tolerances than other brushes I've used or examined. In my experience, this has translated to more consistent performance and ease of maintenance. They are a little more costly than most, so you do pay a small premium.