so christmas has past and santa left me some money for pedals

iv already bought a chorus and ordered a bass big muff. Now my question i still have money for one more pedal, and i want an octave but i also need a pedal that can give me kinda a tube overdrive and just add some dirt to my sound. So can i get something like that from the big muff even tho its not very subtle? or should i skip the octave for now and buy a bad monkey or something?