Look into Michael Schneider (search goinghunting.com or United Guide and Outfitter). He had a great cat area in BC a couple years ago. I've been 2 times in southern Idaho (snow was a problem the second time, got involved in a death march the first time, no lion). If I went again it would be with Michael - I've spent around 5 weeks in his camps moose hunting and he's a first class guy.
I've hunted all across the US, Canada, Australia from well above the Arctic Circle to under the equator, and mountain lion hunting is the most physical hunt I've ever been on.
R