Limited C is the only one that doesn't look like it was whipped up in five minutes, so I like it best by default.

Eripon is going to be devoured by the giants Riho, Mizuki and Sayu in Limited A.
Limited B vaguely reminds me of the Mr. Moonlight single cover.
Limited D reminds me of the regular cover for Berryz' Ai no Dangan (because of the color scheme, most likely).
Limited E looks like the cover for the regular edition of the B-sides collection from a few years back.
Regular A is similar to the promo shots for (I think) the 13th album, but lazier (yellow to transparent gradient fill? Really?).
Regular B is also nice. I wish Up-Front would do more actual group shots instead of Photoshop mash-up disasters.
Is it the 28th yet? Despite my ambivalence toward the covers, the songs are what really matter, and I need to be able to buy them YESTERDAY.