I love my Korg Minis, both the monotribes and the kaoss pads. They don't have a lot of features, but I see them kind of like musical Lego. You just plug them in

I love my Korg Minis, both the monotribes and the kaoss pads. They don't have a lot of features, but I see them kind of like musical Lego. You just plug them into each other in different ways and then just play around all day. And I think buying all of them, plus enough cables to connect them all, would only set you back about $800 total.