If you have an older reciver, look for 7.1 analogs outs & internal decodeing... like the Sony 350 (5.1 analogs), Sony 550 (7.1 analogs), Samsung bd-p2500 (7.1), Panasonic DMP-BD55 (7.1), Sharp BD-HP50 (5.1).
If you have lots of dvd's... dvd playback... The Samsung bd-p2500 is the best, then the Sony's, Panasonic models have had bad reviews on dvd playback.
Ethernet.. yes
Im starting to look around at Blu-ray players and they range from $200 - $400 .. What are the differentiating features between blu-ray players? What features should I make sure my future blu-ray player has, and why.
Thanks

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic