Get the Stumpy!!
I have loved mine. I flirt with clydeness, as well. 275 without gear (I can't bear to weigh myself with gear). The bike is phenomenal. I came from a giant reign with 6" of squish and the stumpy feels about the same at soaking up rocks and roots, but with more stability and ability to carve turns ride over anything. People have called me crazy, but I would not do well on an epic. The extra stability and suspension capabilities on the stumpy are well worth it to me. Besides, I have far more important things to think about than a few ounces or a little more flickability, like how to drag my big butt up and over that hill without squashing equipment or coughing up a piece of my liver.