#1
i heard a boss ds-1( or is it the keeley mod one?) sounds similar to a vox satchurator... is this true? i might buy the vox but i already have a boss ds-1 so wut shud i do?
#2
I can't tell you what to do, it's your money, but I will tell you this, though: The Satchurator is indeed of a similar type of distortion as the DS-1. If you buy it, then it would be as a replacement to the DS-1, and not really something you would use to get a completely different tone.

If you can't try it out before buying, then perhaps check out some demos of it:
http://www.youtube.com/watch?v=FMLM3dJOx8g
#3
you might also want to check out the pro mod with mid control switch from AnalogMan for the DS-1. I am hearing really good things about that mod and what it can do for the DS-1