Good advice Kris. Zenith is actually manufactured by LG and it's there promotional line. Unfortunately, not one of the better choices.
The best low cost 50" class plasma is either
Panasonic's new 2012 TC-PU50, but it retailers for $899. Another great choice is Samsung's new 2012 51" PN51E450 that sells for $619.
These are the very best non-3D plasma HDTVs available.
-Robert