I've been running Plex on my Mac Pro too! Can you get around the sleep problem by running Plex straight off a Plex-ready NAS? Is that possible?
Yes, but you would lose the ability to transcode higher bitrates, which you would likely need if you play any 1080p movies on an iDevice.
What about playing back films on a Mac Mini. Would those not stream in 1080p?
Sure, that would work, although if you've got a mac mini on under your TV, you might as well make the mac mini the Plex server and have the ability to transcode.
I'm trying avoid keeping the computers in the house awake. Wouldn't mind if the NAS was always on though, as I could rely on it when trying to connect remotely from outside the house and access my media through Plex.
Is there any NAS solution that can work around that 1080p problem?