It's tough to say, as the majority of Blu-ray players we tested with the Panasonic last year have now been discontinued - so I have no way of knowing, for example, how the new Sonys would react to your set.
The exception to this is the Sony PlayStation 3 - if you're into gaming and are tempted by everything the PS3 has to offer (streaming, internet access etc) it maybe worth considering, as I know that works fine with the PX70, with minimal juddering.
My only caveat to the latter, however, is that some people seem more bothered by 3:2 pulldown and any related occasional judder (on panning shots) than others - like some people are more sensitive to 100hz processing, or any other digital processing technique.
Could you borrow a few different BD players/PS3 from friends/family/retailer and see what suits your set?