wahjoe, The mg100dfx has a 100W output, which you probably know (do you need that much power !?). The mg30dfx only has a 10" ? brand speaker, compared to the 12" Celestion in the 50 and 100. If you're used to the sound of the 50, you may be dissapointed with the 30. Personally, for around the same money, I would buy a small 30-40W all tube amp combo. Maybe you could find one used in your area.