The D8000 was last years top spec plasma and has had plenty of firmware to update PQ and other issues making it one of the best bargains to be had for any plasma right now. Price match for £850 with John Lewis easily achieved.
The E6500 is this years more mid range plasma which does claim to have something like 10% better blacks. The problem is, it has no reviews so far and not much more info via the forums on this set which means there could be some major problems requiring firmware and fixes to achieve a picture anywhere near the D8000 standard.
I went for the D8000 and expecting delivery this afternoon