Willl this computer configuration work properly

is there anything i've forgotten that i will need to build the computer this is my first try at building one. is the psu good enough will the gpu run modern games at decent fps at least 30 on low res moniter like 1024-768 res If i want to overclock the processor or gpu will i need more fans? im on 680$ budget max ive already reached that here my configuation

LITE-ON CD/DVD Burner - Bulk Black SATA Model iHAS124-04 - OEM
Item #: N82E16827106289
Return Policy: Standard Return Policy
$27.99
1
Arctic Silver Ceramique Thermal Compound - OEM
Item #: N82E16835100009
Return Policy: Consumable Item Standard Return Policy
$4.99
1
MASSCOOL 8W553B1M3 90mm Ball CPU Cooler - Retail
Item #: N82E16835150083
Return Policy: Standard Return Policy
$14.99
1


XFX HD-487A-YWFC Radeon HD 4870 512MB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail
Item #: N82E16814150441
Return Policy: VGA Standard Return Policy
Microsoft Windows Vista Home Premium SP1 64-bit for System Builders w/ Tech Guarantee - OEM
Item #: N82E16832116677
Return Policy: Software Return Policy -$10.00 Combo

$234.98
$224.98
1


XCLIO Godspeed One Advanced Fully Black Finish 0.5 mm SECC / ABS Plastic ATX Mid Tower Computer Case - Retail
Item #: N82E16811103024
Return Policy: Standard Return Policy
XCLIO STABLEPOWER 460W 460W ATX V2.2 Active PFC Power Supply - Retail
Item #: N82E16817189013
Return Policy: Standard Return Policy -$15.00 Instant
-$20.00 Combo

$106.98
$71.98
1




Intel Core2 Duo E7500 Wolfdale 2.93GHz LGA 775 65W Dual-Core Processor Model BX80571E7500 - Retail
Item #: N82E16819115056
Return Policy: CPU Replacement Only Return Policy
Seagate Barracuda 7200.12 ST31000528AS 1TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive - OEM
Item #: N82E16822148433
Return Policy: Standard Return Policy
ECS BLACK SERIES P45T-A LGA 775 Intel P45 ATX Intel Motherboard - Retail
Item #: N82E16813135093
Return Policy: Standard Return Policy
OCZ SLI-Ready Edition 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model OCZ2N800SR4GK - Retail
Item #: N82E16820227269
Return Policy: Memory Standard Return Policy


thanks in advance