I've always seen it spelled crore pronounced (in SAMPA) /krQr/ with 'Q' the vowel in law. In google I get 0.5 megahits for 'crore' and only around 300 for 'krore'. If you're transliterating from Hindi it'd be how I gave it in the etymology: krahor, but even non-Hindi-phone Indians might have a difficult time understanding it out of context. I'll check my links and yours and get back to you.