you might ask that LHS guy what it would cost you to get a 155 or whatever you decide on from him... if he has the 150 maybe he would get the 155 or 100 for you and a keep needle or two in stock for when ya need it?
maybe ask him what other airbrushes he carries... I forget who said it in here, but I would buy what has parts more readibly available in Singapore and does a good job, over something you'll pay 16 dollars in shipping for a 5 dollar needle for.
Badgers are good, the 150 will do what you listed using it for, and probably some finer detail work... but consider if you want to go for even finer detail later, then the 155, 100 or either of the omni's might be what ya want... or if Iwata is easier to get there then maybe thats the way to go?
I wouldnt want to wait 2 week plus for a 5 dollar needle to get to me from the states... and pay 16 dollars for the shipping on it...
the brushes Mike listed are good, I havent used all of them but have heard from and seen enough models done with them to know they do their job... if you're sold on a badger then get ya one! Just make sure it doesn't cost ya more for parts than the airbrush cost in the first place!
That said... ENJOY!!!! I think you will love it compared to that Aztek I sent ya... (if it ever got working for ya after the trip over there...)