I'd give the Raptor 700 a look. Even tho big heavy quads aren't the greatest in sand, since you are a big guy you will want something with some power/torque. Maybe even take a look at a used DS650, or a KFX700...maybe you'll like one of them. But def give the Raptor 700 a try. Polaris Outlaw 525s (solid axle version) is another option, or a used Polaris Predator 500.

Are you looking for used or new?

-Krait