Pedal for sabbath tone?

I have an Epi Sg Special and a Laney AOR Pro tube 50, I know that is the Holy Mountain amplifier but what are some pedals I could dial in closer to a Black Sabbath sound? I've been looking at the CB nagaviper and other treble boosters, but was wondering about the consensus on the CB Sabbra Cadabra in comparison to the DiD Walpurgis vol 2. I've heard great things about both, but the sabbra cadabra is much cheaper. Thanks.