Tough one, especially Howard. I'll go with:
Conklin
Halak
Howard
If Howard improves his play big time and Osgood still falters, that could easily change but as of right now he'd be my last option. Conklin is a great back up and I see him getting around 20-25 games.
I'd put Halak #1 if Price has another year like last but I think they'll want to keep his confidence up if he's playing well and keep putting him out there. But I do see him and Conklin very close in GP either way.
We get one of these - Don't waste it.