TV & Home Theater

[Daitech]

Alright, so I'm currently planning on buying either one of these but they are great set's and I just really wanna get the input of people that has experienced them or knows a great deal about them. The size of both TV that I'm going for is 46 Inch's and the room size doesn't matter to me so exclude that from the equation. Anyways, I'm on the fence on which to get and also am not minding the difference in price for either.

Currently I'm considering either getting the A750 or A850 as opposed to the XBR6 and the A650. Also, is there any big picture quality difference between the A650/750/850 series(other than the less necessary features of each TV), or is it a see-in-person kinda decision?

So help me out guys!!