please help me on which to change in overclocking computer system

I'm trying to build a computer with mass overclocking

I have read a review on the cpu that it can be overclocked to maximum of 4.0ghz

Please help me with the parts. If they are eligable for mass overclocking.

Maximum bugdet of $700.00 is what i can afford.

Maybe a Cheaper Computer Case can be better.

Please Help


COOLER MASTER RC-690-KKA1-GP Black SECC/ ABS ATX Mid Tower Computer Case Real Power Pro 550W Power Supply
Case:Antec Nine Hundred Black Steel ATX Mid Tower Computer Case

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$149.99
-40.00
$109.99

Arctic Silver 5 Thermal Compound

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$5.99

Memory:G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1000 (PC2 8000) Dual Channel Kit Desktop Memory Model F2-8000CL5D-4GBPQ

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$114.99
-40.00
$74.99

MotherBoard:GIGABYTE GA-EP35-DS3L LGA 775 Intel P35 ATX Intel Motherboard

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$89.99
-5.00
$84.99

CPU:Intel Pentium E5200 Wolfdale 2.5GHz LGA 775 65W Dual-Core Processor Model BX80571E5200

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$89.99

CPU Cooler:ARCTIC COOLING Freezer 7 Pro 92mm CPU Cooler

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$24.99

VGA:HIS Hightech H485QS512P Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported IceQ4 Video Card

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$194.99

PSU: PC Power & Cooling Silencer PPCS500 500W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Power Supply

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$89.99
-10.00
$79.99