the SL-5 is almost exactly the amp you describe, except that for some reason they didn't give it an effects loop. seems like a strangle omission to me, when they made it so well featured otherwise. however, combine it with a Badcat unleash, and suddenly you have an amp that can go from 1 watt to 100 watts, plus a post power section effects loop :) starts getting very expensive though. it would mean you could bring the combo home with you for practice, and use the badcat to boost it up through your halfstack at practice. just a thought.
really, if 1 watt is enough, and for home practice i think it is, the JVM-1 does seem to fit your bill.