As I see it you have two choices. 1st is a set ot Pro Max 300 Mercs. 2nd would a set of Merc 225 Optimaxs. Since your boat looks more like a fishing rig the second choice might be a better way to go. A friend of mine has a 31 Cig with triple 225 Mercs Optis and that things is awesome for fishing because those motors idle very well but also run good on the top end. Let me know how it goes!