Many Hardware Questions for i7 Build

Hey guys, I'm having a super hard time figuring out if this RAM will be good enough. I've seen the same (I think) RAM for $400 more, so is this cheap stuff? Also, how is the motherboard? Is a 1680x1050 resolution little in comparison with such a graphics card? Are there any other brands in GPU's I should look at besides BFG? Finally, will this all fit into the case I've picked out and still have good air flow?

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APPROXIMATE PURCHASE DATE: This month

BUDGET RANGE: CND$1500

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Games, watching movies, homework

PARTS NOT REQUIRED: Monitor, keyboard, mouse, speakers - hopefully case and PSU too, if I can find my old compy

PREFERRED WEBSITE(S) FOR PARTS: ncix.com (live in Ontario)

PARTS PREFERENCES: Going with the i7, other than that no preference.

OVERCLOCKING: Yes

SLI OR CROSSFIRE: Maybe (if I need more power, or if I don't end up going with the new DX11 chips right away)

MONITOR RESOLUTION: 1680 x 1050

ADDITIONAL COMMENTS: Hopefully I can find the PSU and old case, but I'm assuming I won't.

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CPU: Intel i7 920 Nehalem 2.66 GHz 1366

Mobo: EVGA Intel Motherboard E758-A1 3-Way SLI (x16/x16/x8) LGA 1366 Intel X58

GPU: BFG Geforce 260 core 216

RAM: OCZ Gold 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600

HDD: Western Digital Caviar Black WD6401AALS 640GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive

PSU: Corsair CMPSU 750W ATX12V / EPS12V

Case: Cooler Master Storm Scout Mid tower

DVD: Samsung DVD+RW

Cooler: Xigmatic Dark Knight-S1283V 120mm

Paste: Arctic Silver or anything like it.