Hey, go with what you feel comfortable with - I'm perfectly happy with my Wren that I've had for years and it won't break me to replace (I have a really nice double action my wife gave me a couple of years ago but I still prefer my Wren). Besides, check out some of the magazines devoted to people who make their livings with airbrushes and you will find airbrushes that retail for four figures.
p.s. to M1rules - Remember Murphy's 51st (or was that 52nd?) Rule of Combat:
"The only thing that will kill a tank is another tank - Therefore tanks will be too busy fighting their own war to come help you in yours"