This is a topic I can actually help with. I own three four wheelers, all Honda, all differnt sizes. The three are the Honda Recon(250) Honda rancher (350) and Honda Foreman(450)
first off I am big guy, yet anyone of them will get it done for the ride into the woods and hauling stuff back and forth. For hauling two people comfortably I would use the 350 or bigger, I use both the 350 and 450 to pretty much pull anything I want from food plot stuff to snow plows. But If I had to do it all over again I would buy the 350 it has plenty of power, is quite a bit lighter, and much more manuverable than the 450. Yet bigger than the 250 which works well, but not quite the all around machine the others are. Thats my $0.02