Good sifi books huh... well The Robotech and Battletech books rule, but to get both you have to go used, but you can get the newest battletech books though there called mechwarrior. And if your willing to do a little work I would seriously recommend Micheal A. Stackpole's Blood of Kernskey(sp?) trilogy sorry for the not so sure spelling but I'm at my sisters place watching her kid so I just can't look at the book its self.