Everything looks beautiful so far, and I'm sure what ever you choose the result will be lovely. I am not a fan of the 4" border concept. It reminds me of the 4" laminate bs of yesteryear. I love the subway tile. I'm not sure which mosaic you think of as the basketweave, but you might want to consider using the small stone square mosaic with the large central pewter accent (just to the right of the stove) in a rectangle with a border/frame around it above the stove. You'll want to think about the spacing of the accent tiles - 4 as you have them, or 6 (mimics the burners) or three in the center. It's hard to know without tile dimensions but you'll figure it out. The image below from stonecontact gives an idea of what I'm thinking.

I LOVE the basket weave mosaic!!!! Could you pls post some pics of your finished kitchen? I would love to see it complete with the backsplash!! Looking great!