One thought before you take the plunge, you might consider checking your HDMI cable as they do sometimes fail over time. Maybe buy a cheap one from Monoprice or something just to eliminate that possibility.
If it's not the cable, of the reviews I've read over time it seems that Denon consistently gets high marks for video processing and also seems to be pretty reliable. Pioneer also seems to be pretty reliable, but not sure if their video processing is quite up to the level of the Denons -- I'd read some recent reviews to see if that's the case.
Hope this helps and best of luck.
If it's not the cable, of the reviews I've read over time it seems that Denon consistently gets high marks for video processing and also seems to be pretty reliable. Pioneer also seems to be pretty reliable, but not sure if their video processing is quite up to the level of the Denons -- I'd read some recent reviews to see if that's the case.
Hope this helps and best of luck.