i am going to assemble a pc
my specs are
intel core i7 930 2.88ghz
ati radeon hd 5770
4 gb ddr 3 ram
500 gb sata hard disk
i am confused about the motherboard that i should buy for gaming
i should buy intel dx58so or intel wx58bp or gigabute ga-x58a-ud3r
in future i want 3 way sli

Of the three, my choice would be the DX58SO after contacting Intel or otherwise confirming availability of a 3 way SLI connector suitable to this motherboard and verifying 3 way support.

Main reasons for this choice:

The DX58SO is WHQL logo'd for Vista Ultimate and Windows 7 based on the test report on Intel's site. Also has more ports and IR.
The WX58BP is a workstation board and only WHQL logo'd for Vista based on the test report on Intel's site.
I don't buy Gigabyte anymore because the only board I ever purchased of theirs leaked caps, caught fire, and setoff the fire alarm system at the office in the middle of the night.