Unfortunately I wont be much help on the Apple front Odey, mainly for the fact that I prefer the ability to custom build my own PCs as that way I'm not forced to conform to the 'closed' nature of Dell/HP/Compaq's hardware or Apple's products in general, I also don't see the point of going with Macs purely based on the 'Malware-avoidance' standpoint as that's what Anti-Malware programs are for.

I can completely understand why someone who purely wants to USE a computer and doesn't really have a need to understand how/why they do what they do, would like to go for the Apple route, they're 'apparently' easy to use in a general sense but IMO it might be more favourable to stick with what you know.
(No harm in trying something new though )

I'd consider some of the more reputable Aussie Online retailers first before looking to go overseas as you might find sending it away for repairs, which hopefully wont happen , may become costly beyond the warranty period (If one is even offered).

The good thing is you know what you want to use the computer for and what you want it to be able to do so that's the first step done, don't let any salesman tell you what you want - Jay and Blackoptimus seem well versed in the Apple area, so hit them up on the specifics dude as they wont lead you astray.

Don't listen to the fanboys, I'm definitely a PC fanboy... but I wont in anyway let that deter someone from what they want - That would make me a Gerry Harvey employee.
(That and I don't believe one's personal opinion should get in the way of one's professional opinion )

I wish you luck dude.