Top Tunes TU-066 is one of the most comprehensive I've seen. ON the other hand, Party Tyme and Sybersounds Karaoke Party make multiplex discs where the songs w/vocal will be heard on both channels, unlike Sound Choice multi- good filler around the holidays...
I have a few Christmas CDGs. One is a 2 disc set from CB, the other was a freebie from karaoke.com. The freebie has the Channukah Song by Adam Sandler on it. I'd like to get some of the Bob Rivers and Red Peters stuff.