I would think about getting a HD 5850 over the GTX 275 but it’s your call, you said Nvidia. Both cards are about the same price and both will run 2 monitors. The HD5850 is new and has DX11
This setup is for 1 GPU and top FPS within your budget.
SAMSUNG 22X DVD±R DVD Burner Black SATA
Item #: N82E16827151176
Return Policy: Standard Return Policy
$34.99
http://www.newegg.ca/Product/Product.aspx?Item=N82E16827151188
COOLER MASTER RC-690-KKN1-GP Black SECC/ ABS ATX Mid Tower Computer Case - Retail
Item #: N82E16811119137
Return Policy: Standard Return Policy
-$20.00 Instant $99.99
$79.99
http://www.newegg.ca/Product/Product.aspx?Item=N82E16811119137
SAMSUNG Spinpoint F3 HD502HJ 500GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive - OEM
Item #: N82E16822152181
Return Policy: Standard Return Policy
-$5.00 Instant $68.99
$63.99
http://www.newegg.ca/Product/Product.aspx?Item=N82E16822152181
ASUS VH236H Black 23" 2ms(GTG) HDMI Widescreen Full HD 1080P LCD Monitor - Retail
Item #: N82E16824236059
Return Policy: Monitor Replacement Only Return Policy
-$20.00 Instant
$20.00 Mail-in Rebate Card
$229.99
$209.99
http://www.newegg.ca/Product/Product.aspx?Item=N82E16824236059
EVGA 896-P3-1170-AR GeForce GTX 275 896MB 448-bit DDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail
Item #: N82E16814130475
Return Policy: VGA Standard Return Policy
$20.00 Mail-in Rebate
$267.49
http://www.newegg.ca/Product/Product.aspx?Item=N82E16814130475
CORSAIR CMPSU-550VX 550W ATX12V V2.2 SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power ... - Retail
Item #: N82E16817139004
Return Policy: Standard Return Policy
-$33.00 Instant
$30.00 USD Mail-in Rebate
$131.49
$98.49
http://www.newegg.ca/Product/Product.aspx?Item=N82E16817139004
G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL7D-4GBRH - Retail
Item #: N82E16820231276
Return Policy: Memory Standard Return Policy
$95.49
http://www.newegg.ca/Product/Product.aspx?Item=N82E16820231276
Intel Core i5-750 Lynnfield 2.66GHz LGA 1156 95W Quad-Core Processor Model BX80605I5750 - Retail
Item #: N82E16819115215
Return Policy: CPU Replacement Only Return Policy
GIGABYTE GA-P55M-UD2 LGA 1156 Intel P55 Micro ATX Intel Motherboard - Retail
Item #: N82E16813128405
Return Policy: Standard Return Policy
-$10.00 Instant
-$10.00 Combo $349.98
$329.98
http://www.newegg.ca/Product/ComboDealDetails.aspx?ItemList=Combo.270439
Subtotal: $1,180.41
You can always add a 2nd monitor latter, and use ATI's Beyond Hi-Definition: ATI Eyefinity Technology with Eye Definition http://www.techlivez.com/2009/09/beyond-hi-definition-ati-eyefinity-technology-with-eye-definition/