if your Kuro is a 50" its worth it to go to a 65" panasonic and take a very slight hit on PQ
if you have a 60" Kuro no it is not worth it to go to a 65" Pansonic
that is my opinion and i woudl not consider a non plasma
the 75 and larger LCDs from those who make them are actually pretty awesome mostly do to their massive size, but besides that the PQ is not close to the level of the Kuro
if you can ignore absolute PQ the LCD could work but i would check them out in person, the 75 is freeking massive, im not sure i have a wall big enough to put one on in my house and not have it look very out of place