Wow. Can I just say wow one more time at your granite? It's crazy. Can you please share it's name and source? It reminds me of a painting, really... great.

Anyway, for the backsplash I think you want to not distract from your granite. White subway might be just fine because it is so mono-chromatic and not terribly eye-catching. I think that I would avoid the tile that matches the wall color, just because it be odd to get a 'near-miss' in terms of color and texture. The white glass in matte or shiny though might be an alternative to the subway. Either way I would suggest getting samples and putting them up on your walls, I know it's changed a lot of peoples minds about their backsplash.

And one more time about the granite: wow.

Gorgeous granite! I agree with brickton in that the color backsplash you're considering is too much of a near miss. If you want added interest, maybe intersperse a bit of the dark (gray or black) color from your granite in a white backsplash?

Thanks for the backsplash feedback and for the granite comments. The name is Kodiak (sometimes called Splendor) and we got it at Bedrosians, which, I believe is a national chain.
I'm off to the tile store for more samples.

I was initially looking for a glass back splash, but ended up with porcelanosa tile

Actually, I think the "storm" brown tile would look great with it. You have natural light from that window over the sink (and in general), plus the light cabinets and a lot of light in the counters, so I think a dark backsplash would be fine! I think the matte subway would be perfect.

Many of us need a light backsplash to deal with lighting issues, but this doesn't seem to be the case for you. So I say...go for it!

I too like the Storm brown tile, though not the matte one. For me glass is sparkly, not matte.

Good luck, Petra