I just bought a Laney class A/B single channel tube amp which sounds awesome but doesn't like my Boss OS-2 overdrive/distortion pedal, so I'm looking to replace it. The amp takes the pedal well if I set it to clean, but terrible if I want to succeed at my goal, which is to add a little more gain to the maxed out distortion sound of the amp, which is enough to play something like Metallica's Kill em All (only if I use my guitar with a DiMarzio Super Distortion pup).

I've tried the tube screamer in a store alongside the boss through a Marshall and both sounded pretty much the same with the Boss set to overdrive mode, so I'm not interested in the TS.

How about that SD pickup booster?