Well, I've looked at lots and lots of pictures today...including the recs above for Bundle Monster and Tuff-Luv. My preference is for book style vs flip and while I still love Oberon covers, I just can't bring myself to pay that much.
At the moment I think I'm torn between JAVOedge - either the Tweed or Heritage and M-Edge Go!.
http://www.amazon.com/dp/B004EM8JBM/
http://www.amazon.com/dp/B00481T1HA/
http://www.amazon.com/dp/B0042AM7HI/
There's a coupon code of 15% off Javoedge or of course M-Edge currently has a sale for 2 covers for $30.