Blackstar's ID:Core 20 is a superb little amp for home use with all of the features of the 40, and the choice of many. It's not all that much cheaper than the 40W though, so unless you want the silghtly smaller form factor or the price difference is important, go the 40. You can always turn it down, but you can't turn the volume up from maximum.

It mightn't seem important at the moment, and isn't as critical if you play high gain or anything from Crunch up in the six selectable presets. But for Cleans, later you will want more from it at 'full noise' if you're like the rest of us.

The ID:Cores are a feature laden and versatile amp, utterly brilliant bang for the buck in class. I mount mine isolated on a foldback stand which renders its output an even more impressive presence with an almost tangible projection of energy in the room.