Personally I'm in the camp of not really wanting Hartline back unless it's at a significant/outrageous discount. It's not to say that I don't value what he brings to this offense and team - it's just there are much, much cheaper ways to get the production he'll provide at the #2 spot. Assuming a Wallace or Jennings signing, I'd put Hartline's salary towards a FA CB and draft a rookie WR in rounds 2-3 to be the #2 WR.
For example, how does Wallace/Bailey and say, Greg Toler look for the same price as Wallace/Hartline.
Unfortunately Hartline just isn't a smart use of cap space for me.