sorry I haven't been online for a while but I spotted this thread and had to pitch in with my two penn'orth.
As Wiseguy might remember, I am very much a Karma fan and had absolutely NO issues with Latshaw systems, that previously owned the rights to Karma.
He mentioned a few other programs and I'll comment as follows;
Just Karaoke is excellent and does pretty much everything you migt want from such software. It also benefits by being pretty much the best bang for your Buck.
Siglos Professional is simply a complicated mess and I found it almost unuseable. I wouldn't recommend it to a dog.
Video Hoster, I can't really comment on as I haven't been able to try it.
Karma is, without comment on Video Hoster, easily the best Karaoke Hosting program out there with only one fairly serious drawback. It guzzles processor power and needs a quick PC to be used successfully.