Howard in a package would get you whatever the same package without Howard would get plus a 2nd. Not going to help. Plus it limits your options only to teams looking for a goalie.
Howard is very, very far from our best trade asset.
Helm, Abby, Tatar, Nyquist, some of our prospects, picks, maybe Quincy or Ericsson, potentially Datsyuk or Zetterberg even. Hell, Mrazek is young, cheap, and has shown a lot this year. He'd bring a better return than Howard, and probably wouldn't hurt us long-term nearly as much as some might think.