Ok guys, I've narrowed my choices down to these two sets, Mitsubishi WS A48 and Sony KP-46WT500. What I need to know is: 1) What differences are there, if any, between the Mitsu WS A 48 and the Mitsu WS48311? The WS A 48 sells at Best Buy, where I get a discount. The Mitsu WS48311...