Sean -
I was lucky enough to have my boat still on shore, so the ladder was the best option for me. I'll be unstepping the mast this fall, so I'll wait until then to redo everything.
Good luck in the bosun chair. I have one but have never put it to use. You might want to play around with the 4:1 block before you hoist yourself up, just to make sure the 7/16 line is not too small to get a good grip on without cutting your hands, and you can safely pull your weight. A safety line with a brake might also be something to consider. Also, I'm not sure if going up is harder, or going down. Once you release that line and let it slip through you fingers, it can get real fast in a hurry.
Tom Smith