neitz Try D. Lawless Hardware for a similar knob at a fraction of the cost. Very much like Restoration Hardware glass knobs. I put them in my entire house.
North American Materials & Manufacturing The counter is beautiful! Have you thought of using something like recyled Glass? It can come in this awesome white color and many others to choose from. You can check out www.nam2.net for more information. Under the products page, there is an example of how awesome it would look in a similar setting!
Here is a link of something similar. http://emtek.com/Cabinet-Knobs/old-town-clear-cabinet-knob