Help and input for Crossfire gaming system around $1400

Approximate Purchase Date: early next week (after finals!)

Budget Range: (e.g.: 1200-1400) After Rebates

System Usage from Most to Least Important: Mostly for gaming, I use a Macbook for school

Parts Not Required: do not need peripherals nor a monitor

Preferred Website(s) for Parts: Newegg.com preferred or amazon

Country of Origin: United States

Parts Preferences: I plan on using an AMD Phenom II X4 965 Deneb BE and 2 HD 5770 GPUs

Overclocking: Maybe, once I read up on how to do it. Any tips?

SLI or Crossfire: Yes

Monitor Resolution: 1920x1200

Additional Comments: I've wanted to build a system like this for a year but the quote 12 months ago was around $1800. I've never built a computer before so any and all input/comments/advice is welcome and appreciated. Thank you all in advance.

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These are parts I have checked out so far on Newegg:

MSI R5770 Hawk Radeon HD 5770 1GB 128-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card

AMD Phenom II X4 965 Black Edition Deneb 3.4GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W

Western Digital Caviar Black WD5002AALX 500GB 7200 RPM 32MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive ; I would get 2 of these; I saw a lot of suggestions for a Samsung spinpoint F3 but I'm under the impression that I would want to maximize the speed of the HD to match with the mobo

toss up between these two mobos

cheap dvd/cd burner/reader combo drive

G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory I'm purchasing two of these today because it's the last day of the promo code. My rationale is that DDR3 is the way of the future and these sticks will last. Hopefully I'm not wrong.

two potential PSUs any suggestions?

Windows 7 OEM or the full edition? is this even an issue that I should be considering?

unfortunately I have no clue as to what kind of case to get

should I consider a heat sink?

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Again, any and all comments/advice/input is welcome and appreciated. Thanks!