Are you just looking to play CSS? If so, an AMD build wouldn't be a bad idea, considering how cheap they are. The 939s have really dropped in price, and a good old single-core 3200+ is really all you need. You could also go for an X2 3800+, but you probably wouldn't notice a huge difference, as CSS is single-threaded. Throw in a 7600GT and a gig of RAM and your system is already looking good. Just add a PSU, case, motherboard, hard drive, CD drive, monitor, and speakers... But I doubt a 3200+ and a 7600GT could play "the next version of cs in 2007." I've never even heard of it before...
You
may need DX10 and dual-core, but I haven't heard anything.