Lots of sexy looking TV's in the £600-£700 price range, John Lewis price match and all TV's come with a 5 year guarantee, same with Richer Sounds who will give you better advice than Curry's. My experience with Curry's isn't the best, don't think I'd ever consider buying a TV from them unless it was an incredible offer - the 5 year guarantee that Richer and others offer is worth a lot to me.
I'm going out to look at the Sony W829B today, £50 more than the TV you're looking at, but it's reviewed well in most of the places I've looked.