GIGABYTE GZ-F3HEB Black SECC Steel / ABS ATX Mid Tower Computer Case
$19.99
http://www.newegg.com/Product/Prod [...] 6811233072
SAMSUNG 22X DVD Burner 22X DVD+R 8X DVD+RW 8X DVD+R DL 22X DVD-R 6X DVD-RW 16X DVD-ROM 48X CD-R 24X CD-RW 48X CD-ROM SATA Model SH-222BB/BEBE - OEM
$16.99
http://www.newegg.com/Product/Prod [...] 6827151244
Intel Core i5-2400 Sandy Bridge 3.1GHz (3.4GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 2000 BX80623I52400
$189.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115074
Western Digital Caviar Green WD5000AZDX 500GB IntelliPower SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive
$69.99
http://www.newegg.com/Product/Prod [...] 6822236068
CORSAIR XMS3 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMX8GX3M2B1600C9
$46.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16820233202
MSI Z68A-G43 (B3) LGA 1155 Intel Z68 SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS
$89.99 and a $15 rebate makes the final price $74.99.
http://www.newegg.com/Product/Prod [...] 6813130614
ZOTAC AMP! ZT-50302-10M GeForce GTX 560 Ti (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
$209.99and a $30 rebate makes the final price $179.99.
http://www.newegg.com/Product/Product.aspx?Item=N82E1681450019
CORSAIR Builder Series CX600 V2 600W ATX12V v2.3 80 PLUS Certified Active PFC Power Supply
$69.99 and a $10 rebate makes the final price $59.99.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139028
COOLER MASTER Hyper 212 EVO RR-212E-20PK-R2 Continuous Direct Contact 120mm Sleeve CPU Cooler Compatible with latest Intel 2011/1366/1155 and AMD FM1/AM3+
$30.00
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103099
The total for this build is now $688.92 and if you want to make any changes then it will add to this total. The cpu is a quad core and will be good for gaming as will the video card. The cpu does not have an unlocked multiplier so the overclocking is severly limited , if you want a cpu that can be overclocked then you have to get the i5-2500k which is $30 more. So that would be your choice , the same goes for the case since it was chosen to keep the cost down , if you want a better case then again it will cost you more.
So the bottom line is that everything can be reworked to have different parts according to your likes and dislikes.