Just remember: you can always downgrade to 4.3.3 from iOS8. The iPad2 is the only A5+ device capable of doing so (I've downgraded myself).
BTW, did you upgrade to any iOS version after 4.3.3 & jailbreak (which means saved SHSH blobs)? Then, with the iOS4 keys and the iOS5+ blobs you saved, you can always restore to that very version.