Building my first pc

This is the first time I try building a new system from scratch. I did my homework as best I could, and after several hours reading about part compatibility and hardware reviews, I came up with this build.

I would like your opinions and comments on my choices, did I make some bad mistakes or forgot a hardware part to have a complete system ?

Processor:
Intel Core i5 750 Quad Core Processor Lynnfield LGA1156 2.66GHZ 8MB Cache Retail Box
http://www.bestdirect.ca/products/220425/BX80605I5750/Intel/

CPU Fan:
Coolermaster Hyper 212 Plus Direct Touch 4 Heatpipe Heatsink AM2 AM3 LGA1366 LGA775 LGA1156 120MM
http://www.bestdirect.ca/products/218427/RR-B10-212P-GP/COOLERMASTER/

Motherboard:
MSI P55-GD65 ATX LGA1156 P55 DDR3 3PCI-E16 CrossFire SLI 2PCI-E1 PCI-E4 2PCI eSATA GBLAN Motherboard
http://www.bestdirect.ca/products/220388/P55-GD65/MSIMicroStar/

Case:
Cooler Master Haf 932 Full Tower Black EATX Case 6X5.25 1X3.5 5X3.5INT No PSU USB eSATA 1394 Audio
http://www.bestdirect.ca/products/182299/RC-932-KKN1/COOLERMASTER/

PSU:
Corsair Professional HX750W 750W ATX 12V 62A 24PIN ATX Modular Power Supply Active PFC 140MM Fan
http://www.bestdirect.ca/products/215850/CMPSU-750HX/CORSAIR/

RAM:
G.SKILL F3-12800CL7D-4GBRM Ripjaws 4GB 2X2GB DDR3-1600 CL7-8-7-24 240PIN Dual Channel i5 Memory Kit
http://www.bestdirect.ca/products/221141/F3-12800CL7D-4GBRM/G.SKILL/

Graphics:
Sapphire Radeon HD 5850 725MHZ 1GB 4.0GHZ GDDR5 PCI-E 2XDVI HDMI Display Port DirectX 11 Video Card 1
http://www.bestdirect.ca/products/?sku=221925&kw=sap

Hard drive:
Hitachi Deskstar 7K1000.B 1TB 1000GB 7200RPM SATA2 16MB Terabyte Hard Drive OEM *3YR MFR Wrty*
http://www.bestdirect.ca/products/213433/0A38016/Hitachi/


DVD-RW:
Samsung SH-S223B/BEBE 22X DVD+-RW SATA DVD Writer Black OEM
http://www.bestdirect.ca/products/218561/SH-S223BBEBE/Samsung/

I plan to upgrade it in 2 years from now with a 2nd HD 5850 in crossfire and an additional 4GB of RAM, hence the 750W psu which might seem a little overkill at first. Does that upgrade make sense ?

I have 0 experience with overclocking, but I think I'll try it through the OC genie of the motherboard I chose since I read it's easy and automatic.

Thanks all!

P.S: My budget range is $1000-1500 (canadian dollars (900-1400$ US..) , this build is currently costing me $1350 can.