Sorry to take your post in a different direction, but instead of the setting, I would be more worried about the quality of diamonds from a chain jewelry store. According to those links, the stones are I1 quality (very poor quality) and since they're graded by IGI, who knows how accurate the color grading is. Furthermore, cut quality is extremely important (most important of the 4Cs in my opinion) and I doubt that those diamonds are cut well. Any amount of money spent on a poor quality stone is too much money. For less than what you paid you could have a beautiful quality diamond (GIA or AGS certified) in the setting you want. I recommend reading up on diamonds on pricescope.com and checking out diamonds on whiteflash.com, goodoldgold.com...basically any one of the Pricescope recommended vendors. After buying the diamond you can always work with a local jeweler to get the exact setting you want.
Thanks for the advice

The first one was a G (near colorless) color and S12 clarity (which means "very small inclusions") and the one I have at the moment is larger but an H (still near colorless) but I1 quality, which they means "large inclusions" but they both looked fine under the gemescope (sp?) to me when I looked at them, and as long as it has awesome sparkle I'm happy with it! To be totally honest, this wasn't something I noticed when I exchanged rings, but the second one is a downgrade in quality even though it's larger. This is something I will have to think about while I'm figuring out what to do!