I have a panny 42" PZ85, picture quality is superb. I recently replaced this with a 52" LCD, but fortunately it suffered from clouding, so i was able to return it for a full refund, ive decided just to stick with my panny.
The only thing id now consider replacing it with is the pioneer, but the cost of the 50" is too much at the moment.
Replace the panny with a sony LCD, you clearly had a moment of insanity

Glad you are keeping the panny. The Pios are well worth the upgrade if you use a tv lots and will appreciate the difference, but they as you have said they are not exactly cheap !