If they plan on extending Elliot then I see no point in giving up any assets to acquire another goalie when you can only protect one from expansion.
I'd be fine with signing a more proven NHL back up though via free agency.
My first choice at this point would easily be
Chad Johnson (Reimer unlikely now IMO)
Calgary kid, played a lot for Buffalo last season with solid numbers.
I'm also OK with having Ortio/Gillies/Rittich battle for #2 as well.