Man how can you guys even mention a Force!?!?! The only thing those pieces of crap are good for is anchors!!! Even with the tough times they have been through I'm still an Evinrude guy. I will echo loudly what B. Gray has said do not underpower the boat, it will eat your motor. I did learn this the hard way and smoked a 115/80 in 4 years and 125 hours of use. Upgraded to a 150/105 and am real plesed with the setup. The 115/80 was the older 90 degree design and the 150/105 is the newer 60 degree design. If I had to chose a different manufacturer it would be Yamaha. Another one to stay a long way away from is Suzuki.
Good luck and tight lines, Jeff