SoulAssassin,
For what it's worth - I've used a lot of airbrushes, I currently own 5. I have a Testor's/Aztek 470, a Pashe HB100 single action, a Badger 150, An Olympus HB-100 Internal mix, gravity feed, and the Iwata Eclipse. For me the best hands down is the Iwata.

I have "test driven" the GREX brushes and have to admit I was very impressed with both the quality of the construction and the flexibility in settings of the brush. Although I don't own one yet, I think Skotsi has a great point they seem to be very nice brushes.

Here in the states the Iwata goes for $149 at Hobby Lobby, but if you look their website you can usually find 40% off coupons almost weekly. I also bought Iwata's whisper quite Smart Jet Compressor ($249 @Hobby Lobby), but use the coupon for that as well. Using the coupons you can land the $400 get up for about $250.

Whatever you choose make sure you do lots of research. These are expensive tools that should last you a long time if you take care of them (I owned my last compressor for 27 years), so make sure it's not only something you can live with, but something you'll be happy with.

Squid