Just to offer additional perspective, I have over 6,500 TV episodes and 300 movies connected to my Mini home theater, and we use Front Row exclusively to access them with the Apple remote. Many of them were purchased through iTunes and I'm able to manually metadata through iTunes and have it come up perfectly in Front Row, every time.
For the heck of it, I tried setting up a similar setup in Plex (figuring the lion's share was non-iTunes purchased and the metadata scraped from Plex would be more visually pleasing. I like a challenge, and I don't give up easily, but I threw in the towel after two days. I tried Plex 8 and Plex 9. I tried manipulating episode titles to make it easier Plex to pull the metadata (which changed the titles in iTunes and Front Row) and I tried telling it to find just my local Metadata. It either mistagged a large chunk of my content, would show 21 episodes out of 22 episodes in a season, and the Media Manager would not let me easily manually make changes, which I gladly would have made.
In the end, iTunes was a snap. Nothing against Plex - maybe there was something I was missing, but it would have turned too many hairs gray.
And I asked elsewhere, but there's a knowledgable crowd here. Front Row works under 10.7 with iTunes 10.4 now. Will it work under 10.5? And is it possible iTunes could prevent it from working with a patch if I upgrade, because easy use of Front Row is an absolute dealbreaker.