Pretty simple requirement. We have all our media/movies stored on a WHS2011 server, and I'm running the latest Plex server on this. I want to put two small, easy to use streamers in our kids bedrooms, probably connected over powerline ethernet. The kids have standard 720P LCD's with an HDMI input.
DVD's are stored in the server in VIDEO_TS format, with a few 1080P MKV's (shouldn't be an issue with Plex though). In the UK, we only have the choice of the Roku LT or XS, and as the XS is the model with the ethernet port, that's the one I've shortlisted, and I know this has a 'real' Plex client available as well. I also think there's a Plex client for the WDTV.
So, it needs to be simple to use and reliable. I don't want it to be dropped either like Netgear did with the NEOTV550 I bought a while back, so good, long term manufacturer support is a must.
There seems to be a lot of users of both systems, so I'd be interested in what people think. Price is about the same in the UK for the XS and WDTV. I always thought I'd get WDTV's, but having held off, the Roku's seem to be getting a lot more popular now.