RE: Sportsman 800 vs Grizzly 700 vs Outlander 800
From what you described I would buy the Grizz 700. You will not get three things with the Grizz 700, that you will with the Outlander 800. 1) power, the power is a night and day difference. However, the Grizz 700 has more than enough power to tackle any terrain you described. 800cc is an overkill for what you described. 2) Comfort, the Outlander is twice as comfortable as the Grizz 700. 3) stability, the Outlander is much more stable than the Grizz 700. Now you will get one of the best traction system on the market, the best steering around, an overall ride you will not feel tired at the end of the day, great intakes both CVT and air box. Out of the box all you need is a good set of aftermarket tires and wheels to drop the ride height, and increase the stability.
The Sportsman 800 is right there, but it does lose me in its big bulky tank feel, and its small 4.1gallon fuel tank. Power wise there is a huge difference between the Outty and Polaris, but again the Polaris just like the Grizz has more than enough power too tackle the terrain you described. The Traction system is one of the best just like the Grizz. The ride and comfort as well as the stability is just as good as the Outlander, and twice as good as the Grizz 700. Awesome storage, and a great overall machine minus the big bulky, doggy power feel to me. Out of the box, and the terrain you described you will need zero mods, other than snorkeling the radiator overflow container
The Outty 800 is really a good overall package, minus the traction system. Other than that its super comfortable, super stable, and nothing compares to the power as of right now. No doubt you will need skid plates for this machine, in stock form this frame will not hold up. The Outlander is a very nice machine, but for what you described I wouldn't get an Outty 800, I would look at the 650 or even the 500. The ground clearance doesn't even come close to the Grizz 700 either, you will need to run much larger tires to get the GC up.
Again from what you described an overall package quad, and I had to pick one machine I would seriously look at the Grizz 700, but if you want that insane power than the Oultander is the choice, and you can compenstate for the traction system if you want. Just depends what is important too you.