personally, I wouldn't buy anything on the net from anywhere, excluding amazon.co.uk, except if I know they have a branch located near me. Because I don't like the hassle of sending it back by mail and dealing it by phone etc if anything goes wrong.
Anything could happen in transit as well... and i know it's a minority and very rare occasions, but I've seen some courriers, when you're not home to pick it up, to just chuck it back in the van... imaging your very new expensive D80 and lens
but of course you get sensible courriers as well!
but any of the shops you've mentioned are good. jacobs and warehouseexpress would get my nod.