The 100g is that single or double action? If you're looking at double action, have you considered the Badger 155 (Anthem)? I just got one about a month ago, and I can spray 1mm lines with no problem, when the paint is thinned properly and the pressure is right. Ask MikeV about the badger, he has several of them.
The Iwata is good, but do you need all that extra airbrush? It's kinda like buying 109 octane racing gasoline for driving around town.
On Bench: AM P-51B, Tamiya 1/48 F4U-1A
On Deck: Hasegawa F-14's (too many); Tamiya P-47D; Academy P-47N;