Thanks for info.V20 : 2010 model.........a top of the class Panasonic's hi end award winning tv
ST30 : 2011 model..........excellent performer, one of the best tv available
UT30 : 2011 model.........entry level 3D tv full HD
UT50 : 2012 model.........entry level 3D tv full HD with upgraded brighter panel
X50 : 2012 model...........entry level 2D HD ready plasma with upgraded panel
XT50 : 2012 model.........entry level 3D HD ready plasma with upgraded panel
I would steer away from UT30 and look at any of the 2012 models. Best would be to go and demo the tv's and then finally decide. Just for info the series go like this from top to bottom : VT, V, GT, G, ST, S, UT, u, XT, X..........so X is the basic entry level while V sits right on top being the most expensive series.
Earlier with the X30 Panasonic did not have any good entry level plasma's compared to samsung but with the launch of the 2012 line up things have changed and both X50 and XT50 are excellent tv's perhaps even better than the entry level tv's from Samsing.
I will wait and watch demo once these gets on display and update here.