Modafinil's fine as a functional stimulant - though inferior, IME, to Ritalin - but there's no buzz to it at all, just a sense of clear-headedness and, at higher doses, unpleasant peripheral stimulation. I would have thought a few mgs of Clonazepam would almost completely cancel out a sane dose of modafinil, and I generaly found less to be more (50-100mgs: took 400 once in a misguided attempt to get high, and instead experienced what fekt like a speed comedown with no preceding rush). It was desgined to have low abuse potential, and while it can be addictive, I've never found it remotely recreational.
OP, be interested to hear if the combo works for you - keep us updated if you feel like it.