For kick? D6, hands down.
I've owned the D6, Beta52, D112, and RE20 and the D6 smokes all of them for a "modern" kick sound with very little fuckery in terms of placement and processing.
The Beta52, D112, and RE20 are all great on bass cabs, depending on what you're going for. Sludgy guitars, too.
I haven't tried the D6 on a bass cab yet, though. Hmmm.... Anyone?