I have bought from HDew a 7d,5d3 and a couple of lenses ,they take about a week for the order cycle and on some deals offer their own extended guarantee ,service is pretty good when delivery due you get an e mail and it is delivered before the next midday.
Digital Rev are usually quicker and give full tracking .They seem to offer a wider guarantee.
I have bought principally Canon from these outlets(Hong Kong) and have yet to have a problem (hope that doesn't tempt fate).
I am currently trying to buy the new Sigma 35 lens but will buy that if they can get one from Clifton Cameras as Sigma UK do not like grey imports and you get a 3yr warranty.
Bought ancillaries from WEX and they are pretty good as well but UK price premium.
In all cases buy on credit card for security, always buy with plenty of time for statement /payment in order to check the goods before paying.