I am a pretty hard core gamer--one without a very hard core PC. But for those that want the fastest World of Warcraft or Age of Conan, you can't go wrong with the new Hardcore PC. Its got military spec RAM, a bulletproof case and the CPU sets in oil. That is right--oil. Computer geeks have been doing this for a couple of years now, modding systems to be able to withstand a lot of heat (see very awesome fish tank computer at right). Oil does that better than any fan could ever do. But if you want one of these, you can expect to shell out $4000. I don't really think I am willing to pay that. The last computer I bought, my friend set it up for me for a total of $700 and I'm not willing to pay much more for a new computer (I'll just wait for one of my friends to buy the newest tech and take their old graphics cards!). If you want to try to do it yourself, you can check out these books:
Build your own high-performance gamers' mod PC
Do-it-yourself PC upgrade projects : 24 cool things you didn't know you could do!
Upgrading & fixing pcs for dummies
Maximum PC via Slashdot