$800 i5 Gaming Build

APPROXIMATE PURCHASE DATE: TOMORROW!!!

BUDGET RANGE: <$800

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Gaming, general internet usage, movies (not HD), I run Dual 21.6" Samsung Monitors

PARTS NOT REQUIRED: Monitors, Mouse, Keyboard, Case (Still need PSU), Hard disk

PARTS PREFERENCES: Intel

OVERCLOCKING: No

SLI OR CROSSFIRE: No

MONITOR RESOLUTION: 1680x1050 X2 (Dual View)

ADDITIONAL COMMENTS: I want a reliable machine, the games i play aren't heavy on resources (GTR evolution) but i don't want to have compatibility problems down the track. Should i make any changes to the below mentioned parts?

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Processor:
Intel Core i5-750 Lynnfield 2.66GHz 8MB L3 Cache LGA 1156 95W Quad-Core Processor - $239

Motherboard:
ASUS P7P55D LGA 1156 Intel P55 ATX Intel Motherboard - $189

RAM:
G-Skill Ripjaws 4GB Kit DDR3 1866 - $135

Graphics Card:
Gigabyte 512mb 9800GT - $128

Power Supply:
Not Sure - Need i5 support; is this possible for less than $100
(Found: Coolermaster Extreme Power+ 550 - $75) ??

SUB TOTAL : $766 AU

So does this mean the rest of the parts i have chosen will work well together? sorry for my newbness