My last four bodies have been grey (7D, T2i, T3i, M) and a couple of my lenses and bits and bobs (E7 grip, E6 Battery, 70-200) so long as you 'trust' your vendor to deal with the customs and VAT side of things (I get an email from them stating that they do)
Not had call to pursue a warranty issue with my grey gear with Canon so cannot comment on that, however I do recall having a storeroom of 18 faulty MV600 camcorders (out of 20 bought) all with dud CCD's, and I recall more recently Canon point blank denying any issue with UDMA cards on the 7D, until they announced a fix for it in later firmware.
So... I'm not convinced about how much a genuine canon warranty is worth in any case. Get insurance. If your kit goes wrong then claim it through that. Insurance is a good idea grey or not as the warranty only covers you for manufacturing defects, and even then, not always.
I used to buy from digigood, kerso and have just bought for the first time from digitalrev. They've changed the colour of my camera, but thats a minor grumble, I'll let you know how it pans out.