Ray-kwen-do

Hey guys. I'm looking for a new bass overdrive pedal to upgrade to from my Boss ODB-3. I have been reading up on the Bass Big Muff and it seems to be a winner so far. Any advice on what I should look at regarding overdrive pedals. I am looking for a chunky bass sound for the Hardcore/Metalcore/Metal band i play in.. Thanks guys, look forward to hearing from you.