Generally, Pentium based systems seem to suffer less problems, although I personally use an Athlon which I've never had any trouble with. (Purchased after 2 pentiums went 'pop' in 18 months!

) A
lot depends on how your system is configured. Mine is a dual boot system with win98 on one partition for the family's general use, & win 2000 on the other purely for video editing. It works well.
As for your camera purchase, as you're in the states, it'd be better to put that question to a 'stateside' forum surely? Our cameras this side of the pond are more expensive & usually different spec to US models. Not forgetting our TV system is different! buying a PAL model for use in NTSC land wouldn't be a good idea. Many moons ago, I made the same mistake, when I bought a camcorder on holiday in Florida. Luckily for me the staff at the store I bought it from were excellent, & took it back for a full refund. So I was only 'out' for the shipping back to the US.
Good luck!