SamyGO

You can try both and tell us the difference. But i have to warn you - manipulating models in service menu can brick your TV.

If you change the model to UC7000 there aren't a lot of differences...
with UC6600 you get: (it is very useful if you have an iphone or a samsung phone, if you have a nokia like me it isn't useful in addiction if you have this function on normal menu of the tv (it is available only for model upper to 6000) you can use gemote e rusamsungtvcommunicator. if this option is not available like for uc6000 you can't use gemote or rusamsungtvcommunicator.
The quality of picture is normal.
if you change it to UC7000
you get: (in mediaplayer you get animated icons, the volume circle it's animated and the channell info too)
If you start internet@tv after you switch to uc7000 model you get automatically the SKYPE widget.
But the picture quality WORSE. This is due to the difference of picture engine because the non 3d tv like uc6000 uc6510 uc6600 uc67000 use hyperrealengine and the 3d tvs like uc7000 has the 3dHyperrealengine.
UC6000 to UC6600 no problem and you get pvr and internet@tv (only for the c6000 with valdeuc fw)
UC6000 to UC7000 picture problem due to hardware differences from the two different models
If you have a valdeuc fw i suggest to change it to UC6600 in order to activate the useful functions and get the better picture quality.
Maybe there is one model that has all functions included the ANIMATED MENU and SKYPE and that use the Hyperrealengine but I do not know if it exists or what it is.
I think that the animated menu could be activated trough the topdebug menu over exlink but i don't have an exlink cable so i can't try...
we have to find a way to get the animated menu withouth change the string name on service menu...

Are there any news because of the animated menus?
I have a C650 and only the activated PVR function (service menu) is animated.
When I change to another model I have the same problems of bad picture quality.