impossible to say up front. it’s a function of your risk aversion and time horizon as much as anything else(http://www.autoadmit.com/thread.php?thread_id=3924565&forum_id=7#35654721)
alt coins get pumped and dumped too often - you can make more but you have to sell immediately or you get wrecked
if you can monitor your portfolio, then altcoins isn't a bad move(http://www.autoadmit.com/thread.php?thread_id=3924565&forum_id=7#35654788)