The OC and G1 series are very good options with the Marvell 9182 Chipset (x2 PCIe 2.0 lanes) which allow up to 1000MB/s vs 9128 which were half the speed due to x1 PCIe. Hmmm I'm not a fanboy of the UD3R, I had to replace my entire office's UD3R's.
NO, the UD3R is NOT better by any stretch.
There's slim pickings @ NewEgg so either the G1 or ASUS P6X58-E WS.