Jon_a_its
Don my 200 was siphon fed, my 150 was top-loading, but both were good in their day.
Look again. Your 150 will be a bottom feed or siphon feed. A top feed 150 is called the 100.
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Iwata are among the finest of the airbrushes, but you do pay a premium for them (though not a HUGE premium). Consider them a BMW and a Badger as a Chevy. The new Renegade line would be your Corvette. You can get a top end Badger for the cost of a low end Iwata. Then consider that airbrushes are not cars, but tubes that spit paint. My philosophy is save some money on the airbrush, and spend the "extra" money on the compressor. I've found that it's the hands, rather than the tool, that's important, and that whatever I can't do with my trusty Badger(s), I won't be able to do with an Iwata, or H&S or Grex. My ability runs out long before the capability of my Badger 100LG. And you can't do anything without a reliable source of air.
Expect to spend between $75-150 for the airbrush, and $150-250 for a good compressor.
CO2 has some great advantages, but my luck would have me running out on a Saturday night during a long weekend where Monday is the holiday. Maybe if I had two tanks...
I use a garage style compressor and pipe the air into my mancave. That way I don't hear the compressor (though my neighbors do, teach them for running their hot tub motor all freaking night!), because it is LOUD!