Any Great Media Centers?

[Difatoni]

Looking at making a media center, but would like to know what people think about some centers.
1. Windows Media Center
2. Media Portal
3. GB. PVR
4. Front Row on a MAc

I would like to us a pc though, for cost. Any input appreciated thank you.

[Waleska]

None is worth a penny, that's what I think, but I'm not to be taken that serious, I dislike media centers with moderated passion anyways.