There are few altcoins that are really promising anyway. Such as; xem/nem, wbb on which there exchange bittrex, this will be like ltc after 2 or 3yrs from now because their project is moving in progress. One more thing if you to more alts that are cheap and promising you could to buy icobid at novaexchange or their road map in the their thread here's the link https://bitcointalk.org/index.php?topic=1605034.0