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Between HX750 and W800 I'd suggest HX750 due to better contrast and overall Picture Quality. W800 will be a major downgrade for you PQ wise as the EX720 had outstanding 5000:1 contrast ratio whereas W800 only has 950:1.
okay ...
dcoolguy - Your best option would be 40HX750 ... Two weeks back, I personally found that the stocks for HX750 are still available across Sony centres ...