I've had super good luck with my D30 Solid dif cover. It's met rocks and ledge numerous times and just laughs at it. Definitely worth the coin.
No matter what you install for covers tho, put some LubeLocker gaskets on them. You'll never regret it!
Yup I have Solid diff covers on my built JK. Just not sure I need something as heavy duty as them for what this thing will see. Also I ordered the lube lockers way back when I bought my lift, so I could get the free shipping on them.