As your post is now over three months old I'm not sure if you are still looking for a big plasma screen? On 3rd October 2011 I went to the biggest Currys shop in Scotland, in Braehead outside Glasgow, to look at big plasma TVs. To be specific, at the LG60PZ950T, Samsung PS64D8000, and the Panasonic TX-P65VT30B. I also managed to look at the Samsung UE55D8000. I took with me two Blu-Ray discs, Star Trek and 3:10 to Yuma. I have to say that I was impressed with the Blu-Ray picture quality of all three of the big plasmas. I couldn't really notice much difference (in shop conditions I know, and I don't think that any of the three plasmas had been specifically set up or calibrated) between the three of them for 2-D picture quality, which is all that interests me at the moment. I'm not into 3-D or smart connectivity. However, I did notice that the 64" Samsung and the 65" Panasonic seemed a fair bit bigger than the 60" LG, even more wow factor to those two. At the time the LG was £1,800, the Samsung £2,800 and the Panasonic £4,000. However, the LG has now been reduced to £1,500, which does make it a bargain for a 60" THX certified plasma screen. (Don't forget though, that unlike the Samsung and the Panasonic, the LG does not have Freesat, it has only Freeview HD.) Just to endorse what I thought in the shop, when I got home (very) late that evening, I played both the Blu-Rays on my 50" Pioneer, and on a quick viewing there didn't seem to be much difference in Blu-Ray picture quality between my Pioneer and the three 60+" plasmas at Currys.
Oh, in the shop I couldn't play Blu-Rays on it so I was watching only the shop loop picture on it, but the £2,500 Samsung UE55D8000 seemed to be a beautiful piece of kit. Yes, I know it's not a plasma, but ...... and the 60" version of it has now been reduced by £500, to £3,500. And remember another, older, plasma from Samsung, the PS59D6900, which I have not seen but is also currently £1,500. And one plasma range down by LG is the LG60PZ570T, at £1,400 (it lacks the TruBlack filter of the 950T) .....
I also looked briefly at the 50-inch version of the top-range LG plasma, the LG50PZ950T, which did look at bit small when I had been looking at the 60"+ TVs. So as everyone says, go big if you can. Good luck!