L'Eroica 2011

OK I have a question:
I'm going to fit a compact double cyclotourist chainset, to run with a medium spread 6 speed 14-24, and I'd love the benefit of any of your collective wisdom...

In short, how low to go? I was thinking about something like 42/27, which gives an even progression of gear inches, but only if I can accurately shift between 27/16 and 42/22, which seems highly unlikely! How much overlap between small ring and big ring ratios would people recommend to a relatively inexperienced user of gears?

Look what I've found...

200 dorra of pure heaven.

I cant tell you how tempted I am...