Id think any of the good aftermarket covers would do, you would prolly break a lot of other things before one of those would. I could see a cast cover cracking or shattering even if you hit it hard enough. but most of the really good covers are 1/4 steel or iron.
Id say its just down to looks, maybe weight if that's your thing to worry about, I have a riddler on my 8.25 and its held up, and my stock D30 took some nasty hits at laurel highlands jeep fest and didn't dent. so its down to looks if you ask me