So i need some help from all you Panny owners.

I just recieved my new Samsung Pn51''e8000 plasma. The PQ is great but it has 4 dead pixels, it buzzes and has brightness pops/FBr (only noticeable while watching hockey). I am contumplating wether i should return it for another Sammy or get my money back and switch to a 50'' Gt50. They are not available in store yet in my area.
My biggest concerns with the GT are as follows...
Brightness pops/Fbr- has anyone seen any reported issues with this on the GT50? How about with hockey? I am a big hockey fan so this is important to me.
Overall brightness- the reason i have always been drawn to the Samsungs over the Panasonic plasma's is that the Sammy's always seem to have more screen pop and brightness. Are the GT50's any brighter than years past?
Black level- the black level on my 51'' e8000 is ok but the larger screen size Samsungs have conciderably better black levels. I am lookin to stay in the 50'' range. So is the 50'' GT black really black or still a little bit grey/green?
Any advice would be appreciated
