K,so i just jailbroke my iphone 3G under 3.1.2 firmware. About 30min before that i had it jailbroken on 4.2.1, i restored it to 3.1.2 becuase it was soo slow it wouldnt get out of safe mod. So my question: should i keep what i have: 3.1.2 jailbreak, or should i move up yo 4.0 jailbreak. Its...