For me, unless you have a Pre that you really love, I would avoid the slave. Those would be boobies for adding more cabs and power to and existing setup, but I still want a little eq control before the power section.
That said, it would really come down to what is available for you to play. Hard to say what will work for you tonally, but there are a number of good starting points. Taking Orange and Peavey out of the running will take away some of the common sleeping gems, but it is what it is. Look at the standard boutique/limited production tube amps. Reeves, Hiwatt, etc.
Something will catch your ear.