the big muff great pedal and you can shape just about any sound out it with some experimenting. if you amp has distortion built in you can get some killer tone for hard rock blues or even some classic metal tone. with the right mixing ive even gotten some hendrix like fuzz with it and my amp.
the boss ds-1 this is also a great pedal. you can shape some good soft distortion (almost clapton esq) and even get some heavy sound (alice in chains other 90's hard rock alt metal) ive even gotten some great blues (srv and george thorogood style sound) again if your amp distortion built in you can use it to shape a very wide range getting as far as metallica (pre black album post kill'em all) to close to van halen.
a few notes on other pedals.
the marshall jackhammer is a good pedal for metal and thats about it. the dod grunge is a good pedal but again its best for hard rock/ metal, but you can get a few good mixes out of it that range from heavy fuzz to mechincal distortion. pod dose make some great multi effects but they are very complex and can rob tone from your guitar/amp (but thats just my opinion cause i hate multifx).
a good peice of advice is to hit guitar center find a guitar thats as close top your main axe as possible and try as many as you can, but i dont think they'd let you hook up an amp like yours (could be wrong though.)
They say the END is near, but I'm Tired of waiting.