I guess it depends on who else we are targeting. Hayes isn't a speed demon and most of us agreed he had some attributes that fit well - I think there's always room for one guy on a line who relies a bit more on guile, positioning and efficiency of movement.
You probably don't have Pavs and Jost on the same line - but say you sign Pavelski and trade for Kadri...you get the clutch goal scoring and a creative fulcrum. A Kadri-Pavelski combo as a base for a second line? Then maybe you stick a fast, energetic winger with them who can capitalize on chances that are created...maybe somebody like JTC?
Compher-Kadri-Pavelski...looks like a legit second line to me. The cap hit would not be crippling at all with Kadri on a smart deal and Pavelski a short-term option. You get flair, experience, clutchness, scoring and energy.