Re: Distortion pedals
Back in the days when I use to rely on my Marshall MG to shred, I would pack in a trio of pedals to get me that Metallica crunch.  It consisted of:
BOSS MT-2
BOSS GE-7
BOSS SD-1
I set the MT-2 a little treble heavy, but with a thick bass and the mids keeping to a low, though not totally scooped.  The mid frequency is at about 11/11:30 to get some serious crunch.
However, the unmodded MT-2 sounds a little sterile and flabby to my ears.  So, I tightened that up with the GE-7.  I set that at almost a V configuration.  Keep some mids, just none enough to take away from that 'oomphing' bottom end, which is key for serious metal.  Keep those high mids running, however, and remember to boost the entire signal by a few decibals (but not too intensely, for GE-7's tend to get noisy, as most boosters do).  My advice is to slowly move each divider to find YOUR sound, but this is just a start.
The SD-1 simply gives the distortion more of a butter feeling.  A little more cream on the cake, if you say.  I, personally, keep the level relatively high while letting the actual drive pretty low.  The Tone control is kept at around 11:30, to balance the bass-treble.  This lets you hear and feel the boost, but still not lose yourself in the gain meltdown.  
I hope this helps.  I found this setup to be absolutely KILLER at bedroom, small gig situations.  PM for any further info.