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I only read a few pages of posts, and with in that nobody really mentioned the most compelling reason to stick with Windows XP... the 3rd party software.
I have literally 1000's of freeware, shareware, emulated, etc. games and programs written to work with my Windows XP machine. This sentence of the article gives away the fallacy pretty early on:
"There is probably a single overwhelming reason you're clinging to Windows. Macs are expensive."
No, it's because I've invested much of my time and energy to playing games and using software that runs on my WinXP machine. And, soon I'm going to rip out much of it's guts and replace it with a faster running WinXP machine. (I'm currently avoiding Vista like the plague!)
I'll turn the old guts into a Linux box, not resell them. :)
jason.