For Marshall-style distortion, I'd also check out Menatone King of the Britains, and Barber Direct Drive. I find them to land right where OD transitions into Distorion land, and they should both stack very well with you Blues Driver. I have those 2, plus a Plimsoul, Menatone Red Snapper, and an A.R.C. Klone on my board; I stack the Direct Drive (which has some compression) into the Red Snapper (which is pretty compression-less) for really good results, and also the Klone into the King of the Britains for tasty tones as well.
As for pedals that have more gain, a lot of my answer depends on whether or not you're doing any palm muting. For tight, chugging distortion, (don't laugh!) I found the old D.O.D. Grunge pedal to be really great! I have a RAT from 1997, the good chip era, and the Grunge pedal was WAY tighter with more gain. I could also turn down the gain and stack it into my old Vox Valvetone for a smoother more singing gain.
For non-muting, fuzz type sounds, I really like the Basic Audio Tri Ram. I have an original Russian Big Muff that sounds awesome when playing by myself, but it gets lost in a mix; no mids. I had to wildly reEQ my amp in order to get even passable results. The Tri Ram has a mids knob and it works like a charm! Also, being a fuzz, it cleans up pretty well!