I would take a chance on Andrei Kostitsyn. He would net you 20 goals..
I would love to bring him back too.
I don't know if he would net you 20 goals playing on a 3rd line, but he'd be an upgrade over most of our wingers. He'd arguably be the team's second best puck handler, with the second best wrister.
He has a thick body, can hit (people forget how he was often among the leader in hits for our team) and sustain the physicality of the playoffs (he usually played solid for us in the playoffs). Our PP desperately needs an injection of skill. And in case MT stays, despite what logic might have you think, MT would often defend AK on Antichambre (how he would deal with AK not fitting perfectly with DA SYSTEM is another story).
People knock him because of how strong the 2013 draft was, but on a $2M contract or less, he might be the best bang for buck deal available on the open market this offseason.
He had a big season in Sochi, and he's playing great during these World Championships. I look forward to seeing how he plays vs. Canada later today.
Also in the category of veteran skilled wingers who want to play for Montreal: Jaromir Jagr. The dude may be crazy old, but amazingly he's still a force out there. He's another potentially cheap option to upgrade our skill on the wing and on the PP.