What style are you leaning towards? have you tried any on? will it be a stand alone or RHR? will you be wearing it with your WB? do you want it to match or not match your WB?
I think you are best to start at a local mall store and try things on. I know you were considering larger 5 stones, then a 7 stone band. It is hard to decide and there are a lot of awesome examples on the boards here but ultimately, it comes down to your personal preference and the other considerations (above).
Get out there and PLAY, girlfriend!!!! (then let us know what your preferences are - we are a curious lot!!)