Is this a good build?

It helps if we know what your budget is and what your monitors resolution is. Give us that info and someone on here can help you. Without that info I can't honestly say if that's a decent build or not.

Here's one worth looking at, you can always add another gtx 275 later on for SLI. If you google "ewiz coupons" or "ewiz promo codes" you can take another $5 - $15 off that mobo/cpu combo. This build is set up more for a monitor with higher resolution seeing how that board is a good one for SLI.

http://www.newegg.com/Product/Prod [...] 6811119137 $79.99
COOLER MASTER RC-690-KKN1-GP Black SECC/ ABS ATX Mid Tower Computer Case - Retail

http://www.zipzoomfly.com/jsp/Prod [...] e=10006382 $109.99 ($79.99 after MIR) Free Shipping
PC Power and Cooling SILENCER 750W QUAD S75CF Power Supply Retail

http://www.ewiz.com/detail.php?name=MB-EX58U4P Combo Price: $492.99 Free Shipping
GIGABYTE GA-EX58-UD4P Core i7/ Intel X58/ DDR3/ CorssFireX & 3-Way SLI/ A&GbE/ ATX Motherboard
Intel Core i7 Processor i7-920 2.66GHz 8MB LGA1366 CPU, Retail

http://www.newegg.com/Product/Prod [...] 6835233029 $39.99
XIGMATEK Dark Knight-S1283V 120mm Long Life Bearing CPU Cooler - Retail

http://www.newegg.com/Product/Prod [...] 6835154003 $4.99
Tuniq TX-2 Cooling Thermal Compound - Retail

http://www.newegg.com/Product/Prod [...] 6814133268 $199.99 Free Shipping*
PNY VCGGTX275XPB GeForce GTX 275 896MB 448-bit DDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail

http://www.newegg.com/Product/Comb [...] mbo.199034 Combo Discount: -$7.00 Combo Price: $162.98 $20.00 Mail-In Rebate
OCZ Gold 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Low Voltage Desktop Memory Model OCZ3G1600LV6GK - Retail
Western Digital Caviar SE16 WD6400AAKS 640GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive - OEM

http://www.newegg.com/Product/Prod [...] 6827151171 $24.99
SAMSUNG Black 22X DVD+R 8X DVD+RW 16X DVD+R DL 22X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA 22X DVD Burner - OEM

Total: $1,115.91 | $1,065.91 w/mail in rebates

http://technet.microsoft.com/en-us [...] ID=mscomsc <--- Save yourself some money on an o/s until March 2010 and dl the 64 bit version of Windows RC 7

http://www.tomshardware.com/review [...] ,2298.html <--- gtx 275's in SLI > gtx 295

http://www.newegg.com/Product/Prod [...] 6824236033 $279.99 ($259.99 after $20.00 Mail-In Rebate)
ASUS MK241H Black 24" 2ms HDMI Widescreen LCD Monitor with 1.3M Pixel Webcam 450 cd/m2 1000:1 (ASCR 3000:1) Built in Speakers - Retail
Color Saturation 92% (NTSC)

Here's a good single card set up for something like a 22" monitor with a 1680 x 1050 resolution. This UD3P board is really too small for two large vid cards, but it's perfect for a single card set up like this smaller case down below is... and seeing how one of those gtx 275's over clock to where it's running almost head to head with a gtx 285 it's a bargain for $200. There's nothing wrong with going with one good vid card now, then ebaying it or whatever in a few years and upgrading.

http://www.newegg.com/Product/Prod [...] 6811129042 $54.95 Free Shipping*
Antec Three Hundred Black Steel ATX Mid Tower Computer Case - Retail

http://www.zipzoomfly.com/jsp/Prod [...] e=10009795 $74.99 ($49.99 after MIR) Free Shipping
OCZ OCZ550FTY 550W Active Power Supply Retail

http://www.ewiz.com/detail.php?name=MB-EX58U3R Combo Price: $450.87 Free Shipping
GIGABYTE GA-EX58-UD3R Core i7/ Intel X58/ DDR3/ CrossFireX/ A&GbE/ ATX Motherboard
Intel Core i7 Processor i7-920 2.66GHz 8MB LGA1366 CPU, Retail

http://www.newegg.com/Product/Prod [...] 6824009145 $159.99 Free Shipping*
Acer X223Wbd Black 22" 5ms Widescreen LCD Monitor 300 cd/m2 2500:1 - Retail