I see the NDP as a perfectly viable option to lead the country, NSSM. They've shown quite clearly here and in Saskatchewan that they can manage an economy. They have done that in spite of some pretty hard times including droughts, floods, BSE, ridiculous transfer payment systems (for every dollar Saskatchewan gets in oil money it must send $1.08 to Ottawa) and the almost-total non-cooperation of the business communty.
The biggest problem with Harper is that he's following the same formula that is failing in the US. He doesn't just want to Americanise us, he only wants to give us the worst parts of the US.
Look at the things he's said, look at his platform. These are the same basic policies that have driven the US deeply into debt, gotten them involved in an illegal war, and made them almost universally disliked around the world. If Harper gets a majority government, that will be what Canada looks like.
Martin is no bargain either. He's all for missile defense. He hired Lockheed-Martin, an American company, to work on the Canadian census. The Liberals have put through a couple of rights-raping "security" bills. They've introduced the gun registry...gun control that doesn't work and costs a lot of money.
If you don't like the NDP, then by all means vote for any of the alternative parties. Don't vote for the Liberals or Conservatives though...a vote for Martin or Harper is a vote to bring George Bush's Amerika to your house.