I am now starting to buy my components like the PSU, case etc. I am holding off on the cpu/ram/graphics until February (tax return, bonus etc) and I believe I will be waiting for Sandybridge. I would like to crossfire, so my initial choice was 2x 6870's, but by the time I am ready to buy, the 6970 will be out and probably some other nvidia offerings.
My first question is crossfire or SLI. I heard many issues with crossfire setups, but I do like the fact that AMD's are cooler and quieter.
Don't buy anything until you are going to build, prices drop every week.
Buying parts at a time will end up just making you waste money. If anything just save money up for the build then come back here at feb tell us the budjet and we will help you pick your parts.