i'd go with my Jetter pedals... the Gainstage Blue for Marshall Plexi tones and Gainstage Gold for the D*mble tones. They stack very well with each other, and they interact with different amps differently, so i'm always well sorted in any show - if one pedal doesn't interact well with a particular amp, the other is bound to sound great with it. So one will be set up as a main drive, and the other is set up as the boost / mild OD.