Tank, in response to your Aztek question it seems that the majority of people end up having their brush replaced within the first 6 months or more frequently. Aztek claim its easy to clean but apparently it isn't and if you take it apart you lose the warranty.
My brother bought an Aztek single action brush last year round xmas time. The brush has been replaced twice because both brushes, original and replacement were leaking air.(came across this here on fsm as well) On his 3rd brush in 6 months but this one seems to work.
Me, I bought a no name brand cheap brush and it works like a bomb however it has no flexibility. I want to try pre-shading etc but the brush doesn't have the ability to control airflow and to spray fine lines etc.
I will not condemn the Aztek brand as I haven't used it personally.
One thing I have found out, is that airbrush choices are very subjective.
I've also realised that it takes patience and lots of practice to get the best out of an airbrush.
During the course of this evening I was reading posts on the ARC forum as well and the 155 got thumbs up all the way.
I think I'm going to give the 155 a bash.
Thanks again for the input.