If you're anything like a serious gamer, you'll need to upgrade again when the Intel PowerMacs are released anyway. Buy a fast PC now and dual boot it. Be aware that upgrading the hacked OS X x86 will likely be a massive headache (or more likely a full reinstall), and be prepared to live with the current version for two years. The you can get an Intel PowerMac, and if you need to boot Windows, you can use the old machine (which you may be about to buy now). You can always throw more RAM and a new gfx card in it. Maybe a new CPU. That would allow you to spread the cost a bit.