I thought i would join this debate about the mac's lol
I have to agree with bifta to a cetain extent. Mac's are generally overpriced and dont offer near enough features to what a x86 based system has to offer - especially in the games area. Ive yet to see any decent games for the mac, apart from Quake and Call of Duty (a few others).
But there are reasons for this. The lack of software is down to the fact that not many people by macs as windows/linux has taken over the majority of home/office computers and therefore its not profitable for a company to port a piece of software over to the mac (also hence why there arnt any decent games titles for the mac).
Also, the whole deal of the mac being overpriced is because only a limited amount of software is available, majority of it being professional workstation type software such as Photoshop, DAW software (protools, Logic Audio etc), and therefore apple has targeted the whole mac and their G systems to these professionals...hence why the big prices for the machines (because they know these people can afford them etc).
However, back to the pc vs mac.....well for my studio gear i would love to get a mac to run all my audio software, especially my whole DigiDesign protools systems because it runs about 100x better than it does on XP, and xp crashes on me every other day

However, a decent mac will cost be nearly 2k (without screens)...and for that, i can get a dual 19"LCD, dual CPU pc system, that will be nearly as good and cheaper than a G5, and i can live with the crashes everyother day, as the money saved can go towards a new piece of equipment (mic, efx unit etc).
However, if i ever get the cash to spare i will be joining the whole mac group, but only for my professional apps. I could never use it as an everyday system because there just isnt enough software and games to keep me busy and happy with the system. Hence, why i will always have a pc, even if i did buy a mac