Hi,
I had a Pansonic PS1, well three actually and then a Sony FX68. The FX68 was alot better, with good geometry and convergence but I found the picture flickered too much. Try it out in the shops and you will see that it is little better than a 50hz and when displaying logos is worse. I got this changed too.
I am now the proud owner of a Sony 32FQ70 which has near perfect geometry and gives a very good picture (as long as you are not watching analogue). This is not a problem for me as I have digital. My only minor gripe is that there is a slight smear of red on logos but this is not very noticable and does not spoil the picture.
Personally I think the 'cheaper' Panasonics are poor. All three of mine had poor convergence and the geometry was only fair. Although it sometimes gave a very good picture, the mentioned problems were too much to live with.
Does you PS12 have crap convergence to the left of the screen?Use the THX optimiser if you have a DVD with it on to check.
Happy hunting. By the way John Lewis get my vote
Pclarke