I buy my gear from London camera exchange in Worcester for the most part now ... I used to buy it from sight 2 sound.
I go local not just for the warranty but for the support... I know Garath and Jim in LCE pretty well, I know they will do me te best deal they can without even having to ask. I go in there and chat **** at them at least once a week probably to the point that I annoy them... But I get damn good and honest service... Sometimes at a slight premium, sometimes not.
Ive had a few niggles with the focusing on the d800, being completely honest it appears I just had it set up wrong... I'm still not sure it is quite as good as the d3 was, but that's by the by! The point is, I visited lce three times with the camera and various lenses, I even bumped into Jim down the pub one night and shatter to him there about it. Between us we have come to a solution that works and allows me to continue to work in the same way I did with the d3! If I'd bought the camera from oz I wouldn't have that service or the peice of mind of that service... But I would have £500 in my pocket ...
I think it's a personal thing...
The chances are you won't have any issues, and you always have this forum for asking questions ... But me personally, I'd opt for supporting my local economy. Not just for the "moral" reasons, but (more) for the selfish long term ones! Local service from smaller shops on stuff like this is just better IMO