Sorry, but I want web designers to do me a favor and make sites that, even if they don't look perfect, at least don't horribly break in my ~860px wide browser w

Sorry, but I want web designers to do me a favor and make sites that, even if they don't look perfect, at least don't horribly break in my ~860px wide browser window. Which, I feel compelled to point out, is a full 100px wider than an iPad in portrait. Actually I would rather use a browser width of 600-700px, as that would fill around half the width of my 13" laptop screen, and be more typographically optimal in terms of not requiring as much horizontal eye scanning, and not stretching out paragraphs into 2 or 3 line horizontal stripes. But there are too many websites out there that assume I have a giant monitor and a browser window that's maximized to fill it.