Welcome, neel. Ooooh, we love it when guys care enough to come here and educate themselves about rings. Your girl is one of the luck ones!
Several board vendors (Amcor, Schubach's, Wink, Images, etc.) can build you this ring, or one very similar, with your chosen BTD Kashmir center. You'll get far better quality than you would from a mall jeweler, and the end cost will be comparable.
The ring you have chosen uses I1 diamonds on the sides, which means poor quality in terms of whiteness and sparkle. If you instead use Moissanite as your side stones, you'll get a giant jump in quality without having to pay extra, if not even save a bit of money. All of your side stones will be small enough that standard unenhanced Moissy will look great.
Check out this stock setting that any jeweler can set for you:http://adwar.com/products/styles/22765L/view
And as long as I did a search, here are the others that are similar to what you've chosen:http://adwar.com/products/styles/20344L/viewhttp://adwar.com/products/styles/23889L/viewhttp://www.uniquesettings.com/products/show/4314http://www.uniquesettings.com/products/show/4240http://www.uniquesettings.com/products/show/13178
There are tons more where those came from, not to mention from other sources. But hopefully this will give you a start.
Your proposal plan is lovely! I can't imagine why you'd need further suggestions.