Well trails are plentiful as well as the "the bog" its everywhere 4x4 heaven especially where I live, its a blast even with the DS its still fun as long as I have a couple 4x4's to pull me out every once in a while.

 

Most AC'S are good i have a 07 700 (Suzuki) engine! But I test drove the 650 and I really liked it but the dealer ran out when i came back to buy one so i just boutght the 700 instead not happy with the suzuki engine becuse you can't rev it before its wamed up or it will die and it takes a couple trys to get started again! And it won't wheelie half the time becuse the shitty suzuki engine has so much limiters and what not! Im thinking about getting a copper head for it though!
07 AC 700 4x4 with 29.5's swamp lites shes my perty trail bike lol!
she is snorkled and has warn 3000 pound warn winch, hand guards, the works!!!!

 

You can't go wrong with an H1. Massive low end torque, and a perfect trail machine. You would have a great package

 

I just purchased 08 650H1 which I use primarily in the winter for hunting coyotes. I have a dog box on the front rack with around 120 lbs in it and usually two riders along with two guns, lunches, tracking equipment, clothes and ect. I run 27 inch 589s with studs for the ice and snow. I can tell you that it has all the power and low end torque that I need. I know that sand is a real test for power but I would think the 650 would be the machine to turn the tires. My nephew runs the 500 can am and it seems have a lot of power also, but I believe the 650 has more low end torque and response although the can am is probably faster down the line and is a smoother running machine. The 650 also has more ground clearance and a locking differential. The can am probably handles better if your tearing around and cutting corners and ect. Hope I helped. As you can see, each machine has advantages: Its all what ytou want and need in an ATV.