Looking for opinions/suggestions on gaming build.

This is the setup i am thinking about going with, would love some feedback as to if anything will bottleneck my performance, and suggestions as to how to avoid those problems. Will be using this for almost completely gaming purposes. Money isn't the biggest issue, but usually tend to stay away from obvious overpricing.

ASUS Crosshair IV MoBo- http://www.newegg.com/Product/Product.aspx?Item=N82E168...
ASUS ATI HD 5870 Video- http://www.newegg.com/Product/Product.aspx?Item=N82E168...
(Currently have 2x HD 4970 cards, would probably keep one to crossfire with 5870?)

AMD CPU - Have 940BE now, wondering if i need to upgrade?
RAM- Here is where i could use the most advice, was looking at possibly OCZ's Black Edition Ram 2x2gb or 4x2gb
HD- Wester Digital Caviar 7200rpm 1tb (x2 in raid)
Case- Antec 1200 Full Tower
Monitor- LG 27" LCD 2ms refresh- http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Any suggestions or comments are greatly appreciated. This is not my first build, and i have a basic understanding of overclocking, though i don't plan to do too much. Would possibly bump up some speeds, but definitely not trying to push anything too far. I know i will have to manually change memory clock settings to get the 1600 or 2000mhz, but willing to figure that out. Again, not too concerned with money issues, but i don't want to spend unnecessary money for little or no performance gains. Have read on a couple sites about problems with Crosshair IV mobo overheating due to some screws being too small or something. Figured they would have fixed that problem or addressed it and offered solutions by now though. Also, may be a month before putting this all together.

Thanks much for your time!