My 55ST30 is so vastly better than my old LG 42PC3D than I hardly can imagine anything could possible be even better
ST30 shares exactly same panel as VT30 (2012's VT50 does indeed has brand new panel, unique to VT) as has same 600Mhz drive.... What is missing is THX cert and advanced calibrations, but in my opinion - i'd rather pay $1000 for my TV every 6-7 years and cry too much then technology makes it obsolete after that.
For deciding on TV current price I used mostly decide.com