Well, what sort of a scenario are you envisioning using your BOB for?

If you need to use it in summer, and you're reasonably sure that you'll be home by Christmas, then you won't need the 4-season tent. Otoh, if you're envisioning an extended vacation from civilisation, you'll probably want to be carrying at least enough stuff to get you comfortably set up for the cold season. <img src="images/graemlins/smile.gif" alt="" />

Another point is that, if you're planning on escaping by snowshoe, you will want to be hauling a sled - much, much easier than carrying 125 pounds of gear on your back. (Not to mention you'd probably need snowshoes 6 feet in diameter to support the added weight <img src="images/graemlins/smirk.gif" alt="" /> ) So you might want to invest in a cheap plastic sled (Can$20 at Canadian Tire) and load your winter supplies in that. <img src="images/graemlins/grin.gif" alt="" />
"The mind is not a vessel to be filled but a fire to be kindled."