$1500 Gaming PC, any advice appreciated

This is my 2nd post about my new build, I tried to listen to advice, put more work into my post this time.



APPROXIMATE PURCHASE DATE: ASAP

BUDGET RANGE: $1500 ish

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Gaming, surfing

PARTS NOT REQUIRED: mouse, keyboard, combo drive, speakers, case and:

Power supply: Antec TruePower 2.0 TRUECONTROL II-550 550W ATX12V 2.01 SLI Certified CrossFire Ready Power Supply - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16817103933


PREFERRED WEBSITE(S) FOR PARTS: Newegg

COUNTRY OF ORIGIN: US

PARTS PREFERENCES: No preference

OVERCLOCKING: Yes

SLI OR CROSSFIRE: Perhaps sometime in the future, would get new PSU if so

MONITOR RESOLUTION: 1680 x 1050



Parts list:


CPU:

AMD Phenom II X4 965 Black Edition Deneb 3.4GHz Socket AM3 140W Quad-Core Processor Model HDZ965FBGIBOX - Retail
$195.99


CPU Cooler:

ZALMAN CNPS10X Extreme 120mm CPU Cooler with Worlds first PWM Fan Speed Controller - Retail
$69.99


Motherboard:

GIGABYTE GA-MA790GPT-UD3H AM3 AMD 790GX HDMI ATX AMD Motherboard - Retail
$124.99


Ram:

CORSAIR XMS3 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMX4GX3M2A1600C9 - Retail
$86.99


GPU:

SAPPHIRE 100282SR Radeon HD 5850 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card w/ATI Eyefinity - Retail
Gah! just went out of stock again.
$299.99


SSD (for OS, swap file):

Intel X25-M Mainstream SSDSA2MH080G2XXX 2.5" 80GB SATA II MLC Internal Solid state disk (SSD) - OEM
$289.00


Hard Drive (programs, media):

Western Digital Caviar Black WD6401AALS 640GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
$74.99


Monitor:
LG W2242T-BF Black 22" 5ms Widescreen LCD Monitor - Retail
$199.99



My power supply is somewhat old, but has served me well. I know I'd need to get a more robust one if I was using crossfire, but will it suffice for this build?

Any corrections/suggestions would be greatly appreciated.