I use Badger 100 LG
http://www.badgerairbrush.com/BADGER_100.asp

with Vallejo acrylic paint
http://www.acrylicosvallejo.com/

Which Iwata are you using? What model is appropriate for doing MRR weathering?
Is the HP-B plus a good choice?

I'll second Sebastian's advice. I use an Iwata HP-C for nearly everything and have done so for 10 years. It's a flexible and practical brush with a good spray pattern. If you're going to do very, very fine work, you can't go wrong with a Micron or a Tamiya HG super fine. Other brands offer similar brushes and many of them are very good also. I think the most important thing for weathering is to use a double-action brush because it gives you much better control.
Have fun!
T.

Thanks for your responses.

I am leaning towards an Aztek A430. Dual action with DVD.

According to the item listing it comes with:
Features:

Patented Aztek Nozzle System for quick effects changes and minimal clean-up

A430 Airbrush

6' (1.8 mm) Air Hose

General Purpose Nozzle /.40 mm

3 cc Gravity Feed Color Cup

10 cc Gravity Feed Color Cup

28 mm Siphon cap & bottle

Instruction manual & DVD

Compressor adapter

Plastic storage case.

---

Just wondering, are there any other nozzles or what not I will need and should order at the same time?

What about for air - do you guys use compressed air in a can or a compressor and which would you recommend? How long will a can last?

Thanks!

It all depends on the job you're doing. A can should last for about one 1:35 model, maybe two. Having in mind that you're just starting, go for a can and then get a compressor. Now, the compressor is a different animal. A good one is not cheap. A bad one will make the whole airbrushing experience a nightmare.
If you choose to work with acrilycs, a moisture trap is not an absolute must, though it'll save on drying time. If you choose enamels, then that is a must have.
As well, a pressure gauge is also a must, regardless of the type of paint you're working with. This helps you regulate the pressure so it can match whatever you're trying to do. Working closer to the model for instance and in this case you'll have to as it is the HO scale, will require a smaller pressure setting. For general work and large areas to cover, you'll be further away from the model and a higher pressure is required.
However, by reading the specs I am not sure what type of air hose you're getting. I strongly suggest getting a braided hose instead of the one the manufacturer is giving in the kit.
This whole thing is quite costly when you add everything up. But it will last you forever.
I hope this helps you.

Eric,
Hobbyrama at Stafford would have them also Bunnings and any large Tool Place eg Total Tools Glenfords.
PM On its way.
N

Would I not need an air compressor with compatible fittings to suit whatever airbrush I purchase? Or are they a standard type or able to get whatever adaptors I'd need?

If you plan on using a can, check in the airbrush's box for a can adaptor. You might need to purchase one - not expensive at all. If you're looking to use a compressor, check for compatibility between your airbrush and the compressor you intend to buy. For instance, my Iwata compressor does not fit the Badger airbrush. Usually, a good compressor comes with adaptors in the box for the most types of airbrush, but you better make sure before you leave the store. Adaptors are not expensive. One more thing. No matter what type of compressor you get, invest in a better hose. The one that comes with the compressor is usually (99% of the time)a crappy, plastic one. Get a braided hose. You'll be happy with it.