Going Mac vs. PC will not stop you from getting a virus, malware, etc.. It just means you'll be attacked less. If you download pirated music, movies, games, software, etc or other random crap all the time from the Internet - your Mac, WILL get a virus too - just like Windows would.
If you want to buy a bad ass machine, then buy a bad ass machine... The OS (Mac, Windows, Linux) is a user thing, and has little to do with performance of the machine.
If you're TRULY worried about mukware, then go with Ubuntu.... stick it on an $800ish crap machine, make it look exactly like a Mac, go get the software that works just like various Mac software, and feel safe knowing your chances of getting a damaging virus, is basically zero and you saved yourself $2,000.
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