Monorail Silver 7663 by Sherwin Williams is similar.

The grey or the White?

What is the grey color?

They do look a bit more square. I'd try Sugatsune or Siro hardware.

Marble does take some care and sealing and I think in a hard living house with kids, I'd pass. Acidic stains (orange juice, tomatoes, coffee) are a pain, although all you really have to do is some maintenance--after all, marble has been around forever and it's a beautiful finish. But I'm all about easy living, so while the kids are young and the livin' is hard, I'd just buy a BIG marble pastry board and put it on top of the island.

Thanks - I'll take that advice!

Most people are told not to use marble for their countertops but they continuously use it on floors. Floors take more abuse than countertops. The only disadvantage with marble, travertine and limestones versus granite is that they are not acid resistant which means if anything acidic makes contact with the stone it will leave an etch mark on the surface, which is not to be confused with staining. Staining can be prevented with sealer but not etch marks. Granite should also be sealed it is still a rock which means it can absorb liquids also! To reduce the visibility of etch marks on stones such as marble, you are better off using the marble in a matte finish. Remember, the more shiny or polished the marble is, the more you will notice etch marks! Besides, marble is supposed to have character, how is it that it has been used in Europe for thousands of years and no one ever complains about it? If you are interested in knowing more or know anyone that is interested in marble then feel free to contact me. Contact David at Marble Trend (416) 783-9911 or simply email me at david@marbletrend.com

I'm confused - Do you mean you're contemplating side walls that reach the ceiling, or just partial walls that the counter might extend over?

In either case, a single wall takes up roughly 4 more inches of width than a waterfall counter or simple end panel - that's 4 inches on either end that could be used for additional storage within the cabinetry...
...imagine having just 8 more inches of cabinet width to store cutting boards, spices, baking sheets, bottles of wine, etc. without using any additional floor space!

There is a similar fixture called Fucsia 1 Pendant by Flos. It is available through Lumens: http://www.lumens.com/Fucsia-1-Pendant-by-Flos/PAAAAAOFAEBBDKAK/Product