Contrary to what others say, I'd recommend staying far away from the Boss DS-1 unless it's been heavily modded to sound nice. The stock DS-1 produces a thin, ugly tone which sucks out all the lows and makes the guitar sound thin and buzzy. I was so disgusted with mine that I considered doing nasty things to it.
There are many better pedals at the same price range, including the SD-1, the digitech bad monkey overdrive, etc.
If you really want great tone get some of the AMT pedals. Davis has the DuHast (Rammstein successor) and a few others.
I recently picked up an AMT "California Sound" and man... that is one heck of a pedal. Throw in some hot humbuckers and you have a real killer, it will stomp the DS-1 and the likes into the ground. AMT does some serious amp modeling. I think the Calif sound models a Mesa Boogie, and you really get a chunky sound with TONS of character. Not like the stock off the shelf pedals. After hearing the AMT pedals I will never EVER go near a stock tube screamer, DS-1 and the likes.