I don't think you can use RBI's + Runs as a way to compare players. Different teams, with different talent around them. Reason being, you plug Dunn's line into that Arizona offense, and he out produces LaRoche's numbers... and vice versa with LaRoche seeing his number drop in Washington.
I'd go with the basic triple slash line.
Dunn - .260/.356/.536/.892
LaRoche - .261/.320/.468/.788
Lee - .260/.347/.428/.774
I'd say the 100 plus points of OPS is quite dramatic. But, I guess depending on your viewpoint, it might not matter all that much.