First, a question to Blackwolfscd (oh, it's very difficult to spell, this one): what kind of medium do you use to decorate cakes, acrylic or enamel ?
Second, I would like to say that though I love Azteks, (a 470 and the first one with no rubber grip) I must admit that they are cheaply built
Third,no mail order on that kind of stuff mylords due to the grip problems (a millmeter more or less makes the difference of feel in the hand, yes I'm French and I love millimeters, centimeters and all their relatives)It is for that reason that I sold a Contempo as I found the trigger to be imprecise
Fourth, the needle of Thayer & Chandler Omnis is 0.46 mm opposed to the 0.30 mm finest needle of Aztek, but it is not only a question of gauge, as use has a lot to do here
Fifth, I recently purchased a Harder & Steenbeck Evolution (it's german) which seems to be of the same quality as the top Iwatas but I paid 200€ for it with accessories (a 0.15 mm needle, a needle travel limiter,etc...) which is less than
the price of an big Iwata but not cheap nonetheless. For Europeans it comes from http://www.obeliks.com in Belgium, for other folks I fear you could not find parts (di I say no mail order, but that was only for Aztek)
So this was my humble contribution