Incase it hasn't been covered already,
Gigabyte has extended SLI support on all their X58 motherboards(I think except the DS4). This after a UD4 owner discovered he could enable SLI by updating the bios of the UD4(previously crossfire only) with that of the UD4P(sli + crossfire). A few days later Gigabyte released new bios versions that enables SLI so people wouldn't have to resort to the bios hack.
IMO this makes the GA-EX58-UD4 the best X58 motherboard from Gigabyte, giving the flexibility of 3 PCI slots by sacrificing the 3rd PCI-E slot, which 99% of the buyers wouldn't have used anyway. I hope Indian retailers get this board in stock soon.