Don't know if you've considered this, but I opted for a Bluetooth keyboard and a separate case/cover.
This is a better option (IMO) for a number of reasons: -
1) There's a larger selection of cases.
2) I don't have to upgrade my keyboard or buy an adapter if I decide to upgrade my iPad 2 (30-pin) to an iPad 4 (lightning).
3) I can share a single keyboard between my PC, iPad and iPhone.
I bought it with a rechargeable battery pack from Apple's website and I've had the same batteries in it now for about six months without having to charge them.