Not sure who you are listening to that is telling you the PS3 does well at SD / DVD deinterlacing / scaling, but I think it sucks at it. The PS3 does a lot of things extremely well, but SD/DVD is not one of them.
I would not get the 872. I would either wait for the 972 (which on paper looks like it will be an excellent machine), or I’d jump on the 3808 bandwagon and put the money you save toward a DVDO Edge video processor. Then you will have cutting edge video AND audio processing.
One negative going towards the 972, is it will undoubtedly come with a few bugs as all new electronics seam to ship with a few nowadays. It will take time and firmware updates to resolve them. The 3808 is last year’s model and is proven.
