For what it's worth, here's the drawing of my battery setup. The benefits of partial-discharge-better-for-battery-longevity aside, I decided to go with the don't-make-it-possible-to-drain-your-starting-battery-with-the-blender setup.
My house circuit draws on only one battery -- my deep-cycle -- while the starting/charging circuit can use the 1/2/both configuration. I'd rather replace a house battery once every four years instead of every three (hypothetically speaking) than forget about my switch setting and have no starting juice when I want it.
S/V Free Spirit
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