When I play, or practice at home with my wife, I use a little Aiwa compact system. It has 60W X 2. For us it is plenty of amplification and sounds pretty good, especially at lower volume. We also sing through it, but I also have to agree, that you have to be careful not to blow out your amp. or speakers. I turn it up a little more than half. Loud enough for us and save for the system.
Have fun,
Eric