I have a '04 Targa 17DC rigged with a 115 Opti pushing a Trophy Plus 4 blade SS prop. Livewells/baitwells full, 2 big guys, full day's worth of gear/necessities, it tops out at 42.6 GPS. It is an awesome ride, never ever wet, tons of room & storage, very shallow draft evenly distributed, fully loaded(14"). There is no where I'd worry about taking this boat (big water, shallow bays, stump bays, etc). I love the boat & would only switch for a Tundra some day possibly. IMHO the 18WT w/115 Opti would be terribly underpowered.......
Maj