I recently built my own rig. (and helped a few people build their own in the past few weeks)
If your budget is only 1,000$ USD then you can find some rather reasonable stuff at
http://us.ncix.com/ .
(They do price matches and imho have the best prices for the US)
My current rig is the following:
i7-3770k Intel Ivy Bridge
ASUS Maximus V Formula (Without ThunderFX)
MSI 660TI (OC Edition)
Western Digital Black Caviar 1TB HDD.
Thermaltake Level 10 Case. (Liquid cooling)
G.Skill 1600 8gbx2 Ram
That cost me roughly ~1200$. (excluding monitor)
If you replace the 660TI for the 650TI (you reduce the price by ~100 - 150$)
Grab a i5-3550 for non-overclocking & reduce video rendering capabilities. (Which is pretty much the difference between i7 & i5)
Grab the ASUS Maximus V Gene.
You can hit ~$726$ USD without the computer case and power supply.
You can grab a reasonable corsair case for ~60 - 80$ and a high efficiency based power supply for ~120$ - 150$.
That is assuming of course you do not do any price matches.
Which would save you ~50 - 100$.