Currently have a Denon AVR 2803, KEF 2005.2 eggs speakers with faulty sub and budget samsung (5 star ) dvd player. Now i'm thinking of either replacing the sub with say Wharfedale diamond or replacing the whole system with an all in one blu-ray system like the Sony bdv-e300. Now will this be an upgrade as im going from dvd to blu-ray or more of a side step cos i'm going from a seperates to an all in one system? Oh I also have Pani px80 42"