Oh, here're a few good features that very few manufacturers include:

HDMI 1.3 auto lip synch feature.

Full video calibration adjustments for each input, not just a global one. You'd be surprised at how handy that feature can be.

User menu to adjust (per input, again not globally) the Reon-VX processor's many features.

Full x/y/z plane aspect ratio adjustments for up to and including 1080p/24 signals with no loss in quality for those with constant height 2.35:1 projection systems and anamorphic lenses.

Scalers that can perform the proper image stretch/crop for 2.35:1 ratio movies usually fail to include adjustments for other in-between ratios like 2.0:1 and 2.20:1-- the latter ratio is the standard for 70 mm movies (where you can place proper black pillarbox bars to keep said ratios intact within a 2.35:1 frame). Given movies with those ratios, for instance, and turning on the scaling for just the 2.35:1 ratio will lead to severe over cropping of the picture, both top and bottom!

If there is to be a powerful video processor onboard and fast DSP audio chips, provide adequate cooling for said chips because they get very, very, very hot. I can't stress this enough.

The Onkyo receivers and pre-amps, for instance, that have the Reon-VX chip and three DSP processor chips onboard get extremely hot to the touch (I'd say almost to dangerous over heating levels) and looking at photos of the insides they have not provided the necessary internal cooling for these "over-clocked" processor chips that are now basically computer CPU's (and any PC out there has very good passive with vent piping and/or active cooling for these CPU's to let them run at safe temps over the life of the product).

Cheers.