Any thoughts about this LGA 1366 build? (And a couple of questions)

APPROXIMATE PURCHASE DATE: Early November
BUDGET RANGE: ~ $1300 USD

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Gaming, Excel, Internet Surfing

PARTS NOT REQUIRED: keyboard, mouse, monitor, OS)

PREFERRED WEBSITE(S) FOR PARTS: newegg.com & bestbuy.com
COUNTRY OF ORIGIN: USA

PARTS PREFERENCES: Intel CPU and probably going to try ATI for graphics (will be first time I buy an ATI card vs Nvidia)

OVERCLOCKING: Probably Not, but may later in life
SLI OR CROSSFIRE: A single raedon 5870 to start with, but want possibility to throw in another in crossfire down the road

MONITOR RESOLUTION: 1680x1050

ADDITIONAL COMMENTS: I'm mainly just looking for general thoughts about this build, and if there are any suggestions on things to change slightly. I'm going with lga 1366 so I can have the option to upgrade the CPU later without having to change the motherboard. My current build is a p4 3ghz, Geforce 7800gs, a system that I have had for umm, quite awhile, so I'm sure anything will be a huge upgrade

A couple of questions: Is there any reason I would not be able to throw in another 5870 in a year or two? Will two 5870s fit in this case? Also, I am undecided on a motherboard

But here is the build I've settled on right now:
CPU: Intel Core i7-920: 2.66GHz I kind of wanted to go with a Lynnfield but wanted 1366 for upgrade in the future ~ $280

Motherboard: Kind of at a loss on this one. Just seems to be quite a selection to choose from. Any I would buy would have to support triple channel, at least DDR 1333 with 6 slots. Onboard audio & LAN. Looking to spend about ~ $240

Memory: Large selection here too and I'm not sure what to go with. Looking for 6GB(3x2GB) DDR3 1333 or higher ~ $150

Case: COOLER MASTER HAF 922 RC ~ $100

Powersupply: CORSAIR CMPSU-850HX I went with 850 W for if I go with Crossfire later on. Or is 850 W still too much? ~ $200

Video: Raedon 5870 I also haven't chosen a brand for this. Any suggestions, or ones to stay away from? And hopefully this price will be lower by the time early November rolls around ~ $390

Harddrive: WD Caviar Black WD6401AALS 640GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" ~ $75

DVD Burner: SAMSUNG Black 22X DVD+R 8X DVD+RW 16X DVD-ROM 48X CD-ROM 2MB Cache SATA DVD Burner ~ $31

Any general thoughts on this? Or improvement suggestions? Or floggings in general? Thanks for your time and reading

Thanks for the combo find! I had forgotten to look for combos, so hopefully that will save me a bit more. And sorry that I forgot to mention the OS. Thankfully I have access to an email account for a university, so I was able to snag a copy of Windows 7 Professional 64bit that will be waiting on me after the 22nd.

Yeah, a monitor upgrade may come into play later down the road if I decided to do crossfire with two 5870s

Thanks for the memory suggestion!