It really just depends on what sounds you're after. And what sound would that be?
as for some of the pedals:
Big muff is a very good harmonic fuzz, very classic sounding. And the DS-1...it's good for what it is. I've been using it as an overdrive (I just turned the distortion all the way down and raised the levels) and it really lets the tone of the guitar shine through (but I want to get a replacement for it soon). As for the polychorus, I haven't tried one myself, but it does have lots of neat gadgetry, but if you're just after a chorus pedal I wouldn't shoot so high. Small Clones are good too. (but if you want the Polychorus, that's cool too) And I've never heard of the T-Rex Mudhoney...