Mind you, this is a full build minus peripheral devices, if you have parts you can put in.. by all means do so! But, if I had the money, this is what I would build for myself if I had the need for it!
Performance/Cost ratio - this is the best you will find. DONT take the suggestion the guy above me posted about the i7 processor, that single processor alone will eat the entire budget and you wouldn't be able to afford a motherboard and ram along with it. Much less an entire system build.
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ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner - Bulk - OEM
Item #: N82E16827135204
Return Policy: Standard Return Policy
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$19.99
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Rosewill CHALLENGER Black Gaming ATX Mid Tower Computer Case, comes with Three Fans-1x Front Blue LED 120mm Fan, 1x Top 140mm ...
Item #: N82E16811147153
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-$10.00 Instant
$59.99
$49.99
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Western Digital Caviar Blue WD3200AAKX 320GB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive
Item #: N82E16822136770
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-$5.00 Instant
$44.99
$39.99
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ASUS M5A97 AM3+ AMD 970 SATA 6Gb/s USB 3.0 ATX AMD Motherboard with UEFI BIOS
Item #: N82E16813131767
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$99.99
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EVGA 01G-P3-1351-KR GeForce GTS 450 (Fermi) 1GB 128-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
Item #: N82E16814130663
Return Policy: VGA Standard Return Policy
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-$10.00 Instant
$20.00 Mail-in Rebate Card
$119.99
$109.99
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Thermaltake TR2 TRX-650M 650W ATX 12V v2.3 / EPS 12V v2.91 Modular Active PFC Power Supply
Item #: N82E16817153116
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-$5.00 Instant
$99.99
$94.99
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G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900) Desktop Memory Model F3-14900CL9D-8GBXL
Item #: N82E16820231455
Return Policy: Memory Standard Return Policy
$69.99
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AMD Phenom II X6 1090T Black Edition Thuban 3.2GHz Socket AM3 125W Six-Core Desktop Processor HDT90ZFBGRBOX
Item #: N82E16819103849
Return Policy: CPU Replacement Only Return Policy
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$169.99
Subtotal: $654.92
654.92 USD = 453.528 EUR
A few points to note: This is just using a budget 320gb Caviar WD drive, easily changeable by whatever you want.. whether its 500gb/1tb - whatever.
The Fermi GPU I noted is perfect for a coding platform, has very rigorous CUDA support, as well as support in the Linux environment (Always use Nvidia in Linux, from what I've dealt with.. MUCH better support!)
2x4gb set of ram for 8gb total, allows you to upgrade to 16gb down the road if you feel you need the extra oomph, or if your work pushes you further and you need a stable platform for running many large applications and coding environments. I can tell you that initially, you wont need more then 8gb, it is PLENTY for any windows based environment par hosting games.
650w PSU is plenty, at max draw (90%) this system will push about 340w, so no need to improve on the 650w - it is modular too, so helps keep the clutter to a minimum.
The computer case I selected there is just a budget case, rated as a top case by Toms Hardware - PLENTY of air flow for cooling, and runs quiet!