Would this setting work most efficiently though a scaler?
I agree, screwing around with the output every time you wanted to change the channel would be a nightmare....
Every time the set top box alters its output to a diferent pixel format the TV/projetor must re sync to the new signal and that typically takes a couple of seconds of black screen, thats why set top boxes and PVR's dont change there output on a channel by channel basis.
Taking the 65" Panasonic Plasma over the 70" LCD was a simple choice but its sad that there is still no true replacment for the 70" SXRD 5 years on. With prices so low these days you would think there would be room for a couple of large up market models but all I expect to see in the next 12 months is a couple of big LCD's that are not going to cut it for quality.