Ordered my 5D MK III on Monday from HDEW and it arrived today. Spoke to them on the phone last week to check when they'd have it in stock and they were very helpful, then a few e-mails sent to them during the week as they weren't able to deliver to a different address to the billing address... no problem with that though and they were very good with their communication regarding this.
Also 3 year warranty, 1 of which is an official Canon warranty.
Only thing I can fault them on is that the box the camera arrived in was the 5D MK III + kit lens... I had only ordered the body and got a little excited they'd sent me the kit lens too by mistake. However in the box was just the body so my plans of recouping some money by flogging the kit lens on ebay vanished
Haven't checked the camera yet as had to come straight to work, but so far I can say that my experience of dealing with them has been excellent