I think I've tried them all.
I've done all of the Boss pedals and have a Line-6 Pod X3. But my 'go to' pedal is the Vox Satchurator.
http://www.voxamps.com/pedals/satchurator/
My chain works like this:
guitar out -> satchurator -> morley A/B/Y switch
Morley A Channel -> Line 6 Spidervalve tube combo amp (with strymon preamp mod)
Morley B Channel -> Peavey JSX Joe Satriani Tube half stack, with a Delta Lab DD1 Digital Delay in the effects chain
I have my Spidervalve combo amp set for my high range, and the JSX halfstack set for my low range, and when playing thru both at the same time its absolutely killer.