engagement ring - Three stone or Solitaire?

Hello everyone!
I am I the process of learning the Diamond World, so that I can make a wise purchase in the next year. We have decided that we like the three stone rings, but my question is what do you then do for the wedding band? Nothing at all, or just something simple?

Currently I have just looked at local merchants to learn what I like. My girlfriend will be happy with anything, but I have standards to uphold. So far, I like a three stone with a center diamond around 1ct and side stones in the .5ct range.

Any and all suggestions would be greatly appreciated.

Thanks,