What's A Great Distortion Pedal For Sludgy Music?

The only pedal I have at this moment is the DS-1. It's a great pedal, but I tend to tune my guitar to Drop B, and it honestly just doesn't do the job at all. Needless to say, I've been looking into a couple distortion pedals lately... but I don't know what would be best for what I need. I know the HM-2 has a killer, chainsaw tone, but I want something with less fuzz. I've also considered a Verellen Big Spider, as it seems pretty great.

Anyways, what would you guitarists suggest? I need a pedal that can handle downtuned sludge metal, that has a powerful, muddy tone, but also able to have notes sound clear(ish) - not just be a buzz.

Here's an example of the sound I'm going for...

http://www.youtube.com/watch?v=Awg99tk6vys

Or this http://www.youtube.com/watch?v=HbSzzmpli4A

Thanks!