Recomended Screen Size Sanyo Z1 / Sony HS10

Hi

I am just about to purchase either the Sanyo Z1 or Sony HS10 (I have not quite decided yet but thinking of the Sanyo Z1 (and possibly later adding a ProV or Brite-view).

I am not sure what size screen to get.

We will be viewing from 14 feet - 17 feet.

I am considering a 92" or 106" diagonal screen.

Do these projectors project a good image at that size (the Sanyo in particular - lower resolution panel etc) ?

Any views / experiences ?