If you have never heard an Empirical Labs Distressor before then you must have seen one in various studio shots from around the world. The Distressor is a true modern classic that has a completely unique sound of it's own!
The Distressor features a unique combination of digitally-controlled analogue circuitry, which offers users the best of both worlds: exacting control and a warm, chunky, sometimes vintage sound.
It is extremely flexible and can be subtle when needed and can also go really hard at the push of a few buttons. Its obviously on the pricy end of the scale, however if you've got the cash you might as well spend it eh?...
More info at Empirical Labs