Is this a keeper? If so, Rask's cap-hit advantage will diminish after this year, so that wouldn't factor too much in my decision making.

Goalies are pretty fickle beyond the top 3... as good as Rask is, he has yet to handle a full-season's work load. I think if you can land one of the "top 3" in a keeper, especially Lundy, I would be all over it, and I wouldn't think twice about the cap-hit.