I'm surprised they would pick these 5 in particular - from what I've seen, VH-1, CMTV and MTV have very little HD programming - the old MHD (or now Palladia) would have been a better HD music choice. I'm not sure about FUSE.
Personally, I would prefer more watchable channels in HD - USA, History, A&E, Sci-Fi, CNBC+ (especially given the recent market turmoil), Fox Business News, HD Net (& HD Net Movies), Smithsonian, MGM and the Premier Movie Channel suites (ie: HBO, Showtime, Starz, Cinemax etc.).
Having said that, any HD addition is good news - I just hope the programming is in HD more than not.