I actually like this idea a lot. it's nice to be able to have variety in what you wear. I like the way it looks when women wear large or fancy diamond bands in lieu of their ER/WB. I usually think of that as a more "casual" look...like an every day look.
have you considered buying a 3/4 diamond band so that you have some flexibility? (sizing, cleaning, no wasted diamonds) I think GnomeNisse suggested that earlier.
I've given some thought to non-eternity bands and finally found one I liked! It's actually a 5 stone ring with .30 stones. Found the reference on Pricescope here. Because there's 5 stones and they don't got around the sides of the finger, I imagine it will prevent the ring from turning, like 3/4 eternity bands tend to do.
All of the sparkley choices!

This one is in the running. It actually appeals more to me because it seems like the more sensible choice as opposed to an eternity ring.
My MIL was looking for a 3 carat diamond at one point. I'm not sure why she decided not to get it, I'll have to ask her when I see her next month. We're flying down to watch her go skydiving for her 60th birthday!
