Ours quit also several years ago. It mounts in a fairly small opening in a cabinet below the TV. So I wrote down the cabinet opening measurements, went to Best Buy, and looked at what they had to fit that opening. They had Sony, Samsung, Panasonic, and another or two. Bought a Panasonic home theater system (blu-ray DVD surround sound system complete with new speakers) as it most closely matched the old one in size. Bought blu-ray as we already had a number of blu-ray movies at home. Did not cost much more than a standard DVD system. Sounds much better than the old one.
You need to look at the home theater systems if you want to drive your surround sound speakers from it. The new system will come with new speakers also. I used the new speakers with the existing wiring.