I don't know too much about PDAs. I just know that there's only a handful of OSes. I think I might be going w/ WM5... What brands/manufacturers are there anyway? no PDA-phone please (I'm hoping to keep the price down by going that direction and, I have a Moto E815 if that matters.) must have: wireless connectivity (BT a must; wifi would be nice but, not entirely necessary) big screen expandable memory good battery life will use for: IM, email, internet, multimedia (will stream occasionally) Help me out?