If you can get the Panny locally and avoid the shipping charge, it's a slam-dunk better deal, IMO. Even with the shipping charge, in the 50" class I would still take a 720p Panny over a 1080p LG.
When I was researching my recent plasma purchase I quickly dropped everyone except Panny and Samsung from consideration, including LG. Not because LG was bad, they just aren't in the same class as Panasonic or Samsung. I rank plasmas as Panny #1, with Samsung a close #2, and everyone else quite a ways back.
As always, IMO, YMMV, yada, yada, yada.