Sorry for the late reply but I just saw your post...my e-ring band is 2.5mm. When I was first getting into the process of getting my e-ring I wanted to go thinner but now that I have my ring the width totally works for me. I find it substantial enough to hold its own with my center stone but not so thick that is takes away from my center stone.
The stones in the band are .04 each and it is a size 4.25.
As for my wedding band...well I''m not married yet
I have to wait until Sept of 2010 so I have some time to go but it will be 2 eternity bands that match with my e-ring and I believe the width on those will be 2.3mm each.
As soon as they are made I promise to post pics!
And all the rings will be done in plat
If you have any other questions pls don''t hesitate to ask