Advice please

My dad wants me to sort him out a 37" TV. He's decided that 32" isnt
big enough and 42" is too much. He's probably right on that given the
size of his living room.

I personally am a panasonic fan, so I'm playing the TH37PX60 against
the newer TH37PX600

http://tinyurl.com/2b5r8j

Everything I have heard about these sets is positive. But is the newer
'600' model worth the extra couple of hundred quid?

And would anyone like to recommend something they consider better?

Cheers
Ed