Home use? A single tray will do it. The V2-GO 100runs somewhere near $100 bucks, has all the bells and whistles, including a USB port on the front if you want to try using a stick. It will also play MPE4 files on disc, DVDs, MP3 files on disc, and almost anything else.
This unit is built at the Pioneer factory, and is pretty sturdy with a lot of features. I use it as a back-up.
Here's a link for specs:
http://www.pssl.com/V2Go-GO100-Standard-Karaoke-Player
You may see a player from Pioneer called a DV-210K at a great price out there. Stay away from it. Besides being no frills, it only plays Karaoke DVDS, not CDG+G
Also stay away from anything from RL Tech. They don't make 'em much worse.