Well i have now seen both sets mentioned above in person.
I know seeing them in store is less than idea but i brought a Blu-Ray and had them setup both TV's in the same room and i played around with the settings myself and watched half the movie on both sets(i have a friend that works at local electronics store, so could take my time)
I like the ST50 better.
Issue is local to me for $1000 i can get the 60" PA6550 not a problem, if i go with the ST50 for $1000 i can only get the 50", would need to step it up to $1500 for the 60" ST50.
So i guess issue is deciding if the extra $500 is worth the extra 10".