I think this is a deal you have to make. Having Quick and Rask along with Pavelec is a great trio to have. ( assuming this is all about the league in sig).
Losing Broduer will not hurt you at all. That's 4.5m right there in salary.
How much time do you have to swing other deals to fix your cap if you do this deal?
I agree you move Thornton around for picks / players, that's 7m.
You'll need to get a little creative, but the deal in terms of fantasy production would clearly be on your side.