I'll go with 45, since it is currently the lowest unselected number between 45 and 185. #'s 43, 41, 40, 38, 37, 36, 35 are also all available (in case anyone was wondering). Also, the average guess thus far is 141.299. The most selected number thus far has been 87 (with 18 people guessing it), followed by 100 and 72 (both have 12 different people guessing those).