Something you Big Game fill probably fit you the best. Malibus have comfy kayaks for folks 200+... old XFactor, or take a look at Stealth 14
http://www.kayakfishingsupplies.com/...alth-12-review
Incredibly stable. All of them will be heavy, well kind of. With some rigging on it, they'll be 60ish lbs +/-, but you'll need that kind of weight if you want a real comfort. You're lucky it's a lake, so you don't have to fight swell and ocean currents.