My brother really wants a PC for gaming, and the rigs out there are ridiculously priced. I've decided to buy spare parts from online, CompUSA, etc. My brother knows how to build computers, however I do not, so I want to give him all the parts. Some of the games he plays include, Nascar Season 2003 and Counter Strike Source. I really don't even know where to start so any help would be very much appreciated. My budget is $1000, with an absolute maximum of $1200, not including the monitor, keyboard, mouse, and other peripherals. Thanks in advance.