E.J. Dionne wrote an interesting article on why the radical right must be defeated before we can think about having a successful moderate alternative party. See "Divided moderates will be conquered", Washington Post, 2011-11-27.
I dislike the terms "throwing your vote away" or "stealing votes from". It's not the supporters of third parties fault that others didn't join them. And third party candidates have won.
Unless there is someone or are somebodies who show exceptional leadership, it seems like Dionne's ideas are best for the long-term interests of the country. But the chances for exceptional leadership seem rather minuscule this "close" to the election. Maybe a new party will arise in time for the 2014 elections. A core might be the RINOs, the Republicans In Name Only, those believe in the Republican Party of Lincoln, Teddy Roosevelt, and Eisenhower and not in the Republican Party of Reagan, Nixon, and the Bushes.