I know I said it and I will say it again that if you can afford it nothing beats the PS3 for streaming Netflix. I use to think that the Roku was good but lately now for three weeks now during peak hours I have been getting poor PQ with HD content with Netflix but the PS3 has no problems. I don't know about other devices though as all I stream is Netflix so I am sorry I can't help you out with that.
EDIT: Sorry I did not fully read your topic. You already have a PS3. My bad.
Earthlink Standard powered by Time Warner Cable Brooklyn.
ASUS RT-N66W Router 374.43 (Merlin Build) using OpenDNS.
Amazon Fire TV, Apple TV 3, Roku 3, Sony PS3 Slim, Sony S5100 all Wired. Chromecast Wireless.
Toshiba 39L2300U 39-Inch 1080p.
Cats are the best pets.