i beg to differ on the outperforming...
the numbers don't line up, ie, 2.0ghz g5 is not equal to a 2.0ghz say pentium IV or whatever.
2.0ghz g5 is more like the equivalent of a 3.0 P4.
cheaper, yes PC is cheaper... but you get what you pay for. i use a PC for this, web browsing, email etc.
no virus/spyware/tojan on a mac. and if you say you dont have anything on your PC, download a free copy of Lavasoft Ad Aware and run it. guarantee you find a ton of spyware (if the computer uses the internet). you'll find atleast 10 files/processes each week, minimum.
build a computer-top notch, P4/amd 64, with a 3.4ghz processor, 250gig HD, optical drives, etc. it will cost ATLEAST $1000, leaning higher to 1500, if you are using good amount of ram.
this computer here- DELL something, pentium4 2.8ghz, 7200rpm drive, 1 gig of ram, is like using my Ibook G4 1.42 ghz. ok so the ibook cost $1300 and this cost maybe $600, but i got a used Imac G5 for $1000 used and it kills this machine and every other i've used, including my boss's 3.2ghz p4 with 2gig ram, 2x160gig 7200 rpm drives that he uses for recording, and that computer cost him $1200, plus monitors ($450). my imac is built into the monitor hehe, and its widescreen!
but i've used PC for simple recording, using a little soundcard and Sonar 2, and that was ok.
PC or Mac- i guess neither is better. Its opinion, and eventually there will be no difference because there will only be one OS- Mac's with Intel CHips, Which i dont think i would buy, can support Windows OS now...
The future is bleak- it's all going to be the same one day. linux is going to take over the world!