Hmm, you should check out Intel's latest Core i5/ i7 CPUs,...
They have been announced and will be available in few days time,...
As for its performance, check this article,...
http://www.tomshardware.com/reviews/sandy-bridge-core-i7-2600k-core-i5-2500k,2833.html
So based on that CPU, here is a potential build,...
CPU - i5 2500K/ i7 2600K
Mobo - P67 boards, choose the better one when they are available in retail,...
RAM - A good DDR3 kit, maybe 8GB,...
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231428
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231314
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145324
CASE - CM 690 Advanced would be a good choice
http://www.amazon.com/Cooler-Master-Advance-Mid-Tower-RC-692-KKN2/dp/B00336EM0W
Video card -
Depends on what type of games you play,...
HD 6870
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150506
Or more powerful HD 6950
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102914
PSU - 750W if you will be going Crossfire
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207003
HDD - Samsung F3 1TB
http://www.amazon.com/Samsung-Spinpoint-Cache-Desktop-HD103SJ/dp/B001U3S5S0/ref=sr_1_1?ie=UTF8&s=electronics&qid=1294378310&sr=8-1
Maybe SSD for boot
Crucial 64GB SSD
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148357
OS - Win 7
Monitor -
http://www.newegg.com/Product/Product.aspx?Item=N82E16824005196&cm_sp=ProductSpotlight-_-24-005-196-_-01062011
http://www.newegg.com/Product/Product.aspx?Item=N82E16824236100
http://www.newegg.com/Product/Product.aspx?Item=N82E16824236048
http://www.newegg.com/Product/Product.aspx?Item=N82E16824001378
There are many more,...
So this should give a good start I guess,...