MS Office, photo editing and computing

APPROXIMATE PURCHASE DATE: within a week

BUDGET RANGE: best price possible in CND$

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: MS Office, Photo editing (Photoshop/Gimp), Computing (ANSYS, SolidEdge, MatLab), surfing the web, gaming, movies.

PARTS NOT REQUIRED: none

PREFERRED WEBSITE(S) FOR PARTS: newegg.ca, ncix.ca (I want to group items and buy from one store)

PARTS PREFERENCES: Intel I7 920 (D0 preferably but not available at newegg.ca)
MOBO (X58 ASUS or MSI or Foxconn or ASRock. I am lost and need help to choose) or should I go with P55?
PSU CORSAIR CMPSU-850HX (179,99 CND$, first choice) or 750HX (is unavailable) or CMPSU-750TX (wondering if the 750TX at 129,99 CND$ is a good pick for the price)
CASE COOLER MASTER Storm Sniper SGC-6000-KXN1-GP (but open to suggestions)
CPU cooler Noctua NH-U12P (nothing else)
HDD Western Digital Caviar Black WD1001FALS 1TB
RAM G.SKILL Ripjaws (low voltage), 6 GBs
GPU NVIDIA Quadro FX 1800 or 3800
23'' LCD not chosen yet

OVERCLOCKING: Yes, to 3.6 GHz

ADDITIONAL COMMENTS: I would like a quiet PC and good appearance but not flashing with USB, IEEE 1394, e-SATA and audio connectivity on the front top panel.

I am lost trying to choose the right motherboard for my needs. All your help are truly welcomed.
Thanks

Your missing a DVD drive and an OS.

Also, a Samsung Spinpoint F3 HDD would be better as it is cheaper and faster.