FYI, you can find virtually all of these cases on Amazon for less (including shipping) than eBay. Just search "i727 hybrid". If you're planning to mix and match, keep an eye on the manufacturers. Mybat and Case-Xpro seem to be the same company (or, at least, identical designs), but Dragoncell, which makes the cases shown in the OP, uses a different size of plastic mesh than Mybat/Case-Xpro do.
I'm going to order one Dragoncell, one Mybat and one Case-Xpro and see how much I like each. I'll post results here. I mean, $25 for 3 cases (incl. shipping) isn't much to complain about.