I may not end up getting a Sony BDP-X70 blu ray player as I keep reading on AVS forum about the problems these players are having with streaming, and that the built in wi-fi on the s570 is somewhat flakey.
I see the RX-V1800 uses the Anchor Bay 1010 chip while the AVR-1910 I have uses the Anchor Bay 1030 chip... I can confirm the 1030 chip does a bang up job on upscaling/deinterlacing, but the only thing I upscale with my RX-V1800 is the Wii, and since that doesn't play dvds it's hard to tell how good of a job it does at upscaling/deinterlacing, but I'm sure it's still good, and much better than the older faroudja DCDi chips they used to use.