That's true. You can use a class A amp, as a heater, when not sending current to your speakers! I had an Arcam amp that was class A, up to 20 watts and then class G for the remaining 100 watts per channel. I couldn't hear the transition, to be honest and it did sound great, but quite a large unit, with no digital inputs etc. I'm sure you'll find something suitable, with your current budget.