Try www.billbarnes.com
I was looking at those ring styles for my fiancee and found their site to contain more styles and show all the pricing options. Also they will mail you a free ring sizer in less than a week and are very responsive.
The other option is if you buy a diamond from a local vendor like Whiteflash and others, often they can have their personal jewelers create something "almost" like what you want.
Sincerely,
John Wild