Which Airbrush? (choice of 3)

[wedgetailaus]

Living here in Australia airbrushes can be expensive! Considering I've never used one before I'm not in the market to spend a huge amount, so I've found some cheap ones on eBay that I think will fit the bill. There are some differences though and being anything but an expert I'm hoping for some advice. These seem to have different nozzle sizes and a few other differences.

What's the best choice for painting foamboard planes???

http://www.ebay.com.au/itm/1-6HP-Vo...4&hash=item1c562a622d:g:QJoAAOSwZKBZGs80#rwid

2 different types of guns?

http://www.ebay.com.au/itm/Voilamar...713342&hash=item1c6916ec2b:g:J58AAOSwOVpXaQb6

different guns to above?

http://www.ebay.com.au/itm/1-6HP-Vo...322215&hash=item1c552fe672:g:PxEAAOSwrhBZHqt7

has a holding tank?

Any expert knowledge or advice would be greatly appreciated!