^^^I'd echo the recommendation for those two sets. Between the two the Sony will have a little better sound quality and probably fewer HDMI handshake issues, though this isn't much of a problem with any major make any more. Out of the box Samsungs usually have sharper, more vivid color, Sony a tiny bit softer and more natural color. Since doing a few picture adjustments can tame the Samsung and punch up the Sony this also needn't be a deal breaker if you're willing to experiment a little in the setup menus.
To be honest one could choose between these two sets based on physical appearance and price alone and not go wrong. If you decide to go up to a more feature laden set you'd pretty much have to eliminate Samsung as every Samsung series 650 and above has a really shiny screen surface.