I also tried to get the DFI DK 790FXB M2RSH, no joy though, I couldn't find it anywhere in the UK (anywhere that I looked, obviously) so I settled on the older DFI UT 790FX M2R in the end, other than some initial issues with it miss-reading my memory speeds and and not wanting to even let me flash the bios (I got around it with some manual ram timings prior to flashing to the updated bios), I haven't regretted it yet ...then again, it's only been a day. But if I am not regretting it within the day it's usually a fairly good sign in my experience. I'm not sold on the SB750 south ridge anyway tbh, I don't think it's that important for a PhII. I have not tried overclocking yet, I'm going to run in for a week first.
The weather did not seem to hold my order up at all though, got it frist thing this morning.