I currently have a Sony 570 mr blu-ray player and have had a happy 2years of sreaming and movie watching so far.I am thinking of taking the plunge into the 3d world of movies and gaming and will be buying a 3d tv soon.At the moment there are offers with 3d tv's that include 3d blu-ray players.My question is,is there a difference between a Sony 570 and a 790,do I stick to my faithful 570 or do I get a new 790? Thank you for all replies.