I've got TV shows, movies, and video podcasts stored on my computer. And I like to watch streaming video from Hulu. At the same time, all our comfortable furniture is pointing at our 47" TV, and not pointing at my 20" iMac.
The solution might be Popcorn Hour. It's for both the Mac and Winbox, and it'll play almost everything that isn't DRM'ed.
I'll admit I find the set up procedures for this type of device a bit intimidating. But the rewards in getting the device up and running will make it worth the struggle.