Taking a step backwards, Galchenyuk and Radulov should probably be 2 of the 3 forwards on the first line when things are rolling at ES. When it comes to PP1, though, I'd start Pacioretty-Plekanec-Gallagher. Percentage-wise, and not that it's pretty however you slice it, between those guys you have the combination of faceoffs, board work, and net front pressure that you hope to use from set plays in the O zone. And they play well together anyway. They should be the line trying to establish possession, and maybe getting a Gallagher greasy one early on. They should follow THAT up with the speed and skill of Galchenyuk/Radulov. Much of the time you might even get those guys in on the fly against slightly tired lines that way, and you get the best potential out of both your PP lines.
But I guess that makes too much sense.