I think having the options all on the same page is important. It helps weigh the differences, and avoids the ambiguity of "Will my changes above be saved if I switch to another tab?".
All I needed to read that screen more clearly was better delineation between the options. A light-colored horizontal line worked fine for the options further down the page, but I missed the button I was supposed to click because it was overwhelmed by the shiny Google buttons.
To go all Web 2.0 on your ass, I'd suggest a nice colored-background-with-rounded-edge box that each option sits inside of. Each box has the title of the option ("Redirect" or "Mirroring", etc), a "?" for more info about this option, the necessary fields to fill out, and a button for activating this option.
Sure, the page gets 25% longer with all the box edges, etc, but each option is clearly delimited, and all the pertinent details for each option are clearly packaged within the box. The utility is increased, even though the page is longer.
(And honestly, people access this screen, what, maybe 10 times during the entire lifetime of their DreamHost account?)