Well, if it was me who had to choose between these pedals, I'd go for the Metal Zone bec it has higher gain that satisfies me, but other people would prefer the DS-1 & DS-2 .... these pedals gives different kinds of distortion, I suggest you should try them all to choose which one you realy need, but for the '80s sound , the DS-1 is your right pedal..

Also think of a good multi-effect for versatility, if you buy a Distortion pedal, no matter how different settings you'll try, it will still have the same basic sound charactaristics of the pedal..