I ran a MinnKotta Maxxum 55 pound thrust on my 1648 Roughneck then put it on my 1860 Horizon when I bought it. Until I began pretty much exclusively trolling, it was plenty of motor. I then went to a PowerDriveV2 55 pound on the Horizon. Wasn't happy until I went to the Terrova 80 iPilot.

For your boat, I would think the Maxxum 55 would be the best choice.