Thanks for the comments, guys. Higher capacity PSUs are an option, but they get a little pricy from 200w out. As far as performance, the most it will do is playback SD video, capture video from a webcam (15 fps low res stuff.) I don't see any reason draw from a system for this purpose will be very high. -- I'll revisit the topic once I have a more solid part list in mind.
Anyone have working experience with LCD's in low temps? maybe there are some variables we can look at there.