If you have large enough hands, no arthritis or other problems with gripping things, don't mind carrying around a mod that feels like a brick, and your pockets are pretty deep $ wise...I'd recommend the Hammer of God, too!
A friend who's an ECF member bought one last year. He also bought 2 different, humongous Voltrove RBA that he used on it. Tank capacities, IIRC, were something like 15mLs for the smaller one and 20-25mLs for the larger one. I couldn't believe what the set-up weighed when he had me hold it once, even with the smaller RBA on the mod, let alone with the beast size larger one on it!