Another $1000ish New Build -From a Newb!-

I want a new system that will last for 3-5 years with options to upgrade perhaps along the way. I'm budgeting for around $1000+ I'm focusing on a game oriented machine. It should also be noted that I'm interested in safely overclocking, so any comments, insights, or suggestions along those lines would be appreciated.

So far I've accumulated a lot of suggestions, read a lot of articles, and other new build posts and have come up with the following. Some of these are ORs because I'm really not sure which direction to go.

Processor - E8500 Wolfdale 3.16
http://www.newegg.com/Product/Prod [...] 6819115036

Ram - Kingston Hyper X 4gb
http://www.newegg.com/Product/Prod [...] 6820104038

OR

Ram - G.Skill PI Black 4gb
http://www.newegg.com/Product/Prod [...] 6820231209

Mother Board - I can't even come up with a suggestion, obviously a P45 but which and at which price point to fit this rig?

Video Card - Sapphire 4870 1gb
http://www.newegg.com/Product/Prod [...] 6814102801
(I've selected this video card so that down the road I can crossfire it and be "back in the game" as far as performance)

Hard Drives - 2x Western Digital Caviar SE16
http://www.newegg.com/Product/Prod [...] 6822136218
(I've read that running a RAID array is the way to go for a gaming machine, or is that a misunderstanding on my part?)

PSU - CORSAIR CMPSU-750TX 750W
http://www.newegg.com/Product/Prod [...] 6817139006
(PSUs are almost as bewildering as mother boards, is this a worthy selection, and will it fit the bill for safe over clocking and a future Crossfire configuration?)

Cooler and Bracket - XIGMATEK HDT-S1284EE 120mm Rifle CPU Cooler
http://www.newegg.com/Product/Prod [...] 6835233023
AND
XIGMATEK ACK-I7753 Retention Bracket For 4 heatpipes
http://www.newegg.com/Product/Prod [...] 6835233020

Case- COOLER MASTER RC-690-KKN1-GP
http://www.newegg.com/Product/Prod [...] 6811119137

First, I want to know if I'm making any foolish mistakes with these part choices.

Second, which RAM kit should I go with and explain why.

Third, could somebody please recommend a reasonable P45 that will allow me to do some safe overclocking and will support my option to crossfire later.

Last, If you are going to recommend an alternative part choice, please explain why.

I think this forum is awesome by the way, thanks for all your help and advice in advance.

-KittenousBeast

As shortstuff_mt said, go with the P5Q Pro and go with the bundle deal with the E8400 instead of the E8500 you have picked out. Will save yourself $50