Ignatieff wants a One on One debate with Harper.

I Agree, this is a great idea.
Liberal leader Michael Ignatieff did his best to ensure the debate about the debates remained open Friday when he issued an open letter to Prime Minister Stephen Harper urging him to accept the challenge of a two-man debate.
"You will recall that when you issued your challenge, I immediately responded, accepting with enthusiasm," Ignatieff wrote.

The following debates should also take place:

2. Harper vs Layton
3. Harper vs May