I have both the X58A-UD3R and the OCZ Gold 1600 RAM. I recommend both. The X58A-UD3R is a feature-packed board at a very reasonable price. It has quality components and more expansion room (more USB, SATA, PCIe, FireWire, IDE, and FDD options) than the popular ASUS P6X58D that costs $100 more. It also is a good overclocking board, the BIOS settings are easy to change and it recovers from crashes pretty well. It also has Dual BIOS so if one BIOS flash goes wrong it has a backup to prevent bricking.
As for the OCZ Gold RAM, it defaults to 1066MHz (which is simply a lower RAM multiplier). This is absolutely not an issue. OCZ says they made it that way for compatibility with boards that don't support 1600 well, but it is guaranteed to work at 1600MHz if you set the multiplier up yourself. This is dead simple on the X58A-UD3R, just go into the BIOS, go to the Motherboard Intelligent Tweaker screen, find the RAM multiplier, and use PgUp/PgDn to adjust it until the frequency changes from 1066 to 1600 (I think the default is 8x multiplier, you want 12X since the base clock is 133, 133x12 = 1596 which is within specifications for 1600MHz DDR3, the clock varies a bit anyways so it never is exact).
With my setup, I have base clock at 215MHz and my RAM multiplier at 8x for 1720MHz. The OCZ RAM handles this just fine at 1.64V. The motherboard says that this is slightly high voltage but the OCZ RAM is rated for 1.65V so it is safe to run at 1.64, though at stock 1600MHz it will probably work at 1.55 or so.