Sorry for the late reply Sir.
Malware is on the up with Apples for a number of reasons but normally far far safer than MS Windows as a rule.
I would advise you have anti virus protection and keep the OS updated etc
The percentage of apple devices out there is increasing and the type of nerds who write malware are not all happy with Apple both reasons why apple in the past as well as the design of the OS (which the newer Windows ie Vista and 7 mimic to a degree) helped stopped the spread of malware.
The new OS is out very soon so see what can be done about updates with the device you get. http://www.apple.com/macosx/lion/
If you like apple but dont need to be quite at the cutting edge of course that means often the older stock which is perfectly good maybe a little cheaper
Nothing wrong at all with Apple but be advised if you like to fiddle unless your well off they are not the devices for you as a rule.
For example we have many Apples at work which are rarely updated physically so have to be sidelined and updated as new OS versions come out eventually. While many older PC's are basically "Triggers broom" with nearly everything changed in them and allowed them to keep up with what is needed of them for a little longer..
Also if the PC will end up in Pinas as much of fellow users Tech equipment does will the apple be useful there in 3/4/5 years???
If you need any assistance or info on Apples just ask and I can enquire with our Apple Gurus at work.
PS a word about Apple marketing they take features which are sometimes brand new and some not so Brand new and hype them as amazing.
If you compare what is available elsewhere often you will go oh is that all. But that's what Apple do package things well whether it is unique and well designed or simply a function you would expect on a standard Device of its field.
All I say is make sure you stand back and see though the hype and see the facts.