I'd like Stastny for sure since this roster is begging for another scoring center. Callahan isn't a bad idea. I'd be okay with Ott, but given the choice of the two would prefer Callahan since he is better defensively than Otter. I still like Moulson, although I'm sure he has other destinations in mind at this point. One name no one has mentioned who I think wouldn't be a terrible UFA addition is Lee Stempniak. He is a local guy who can score a bit and wouldn't cost too much.
I wouldn't mind another reasonably priced veteran d-man to replace RFA McBain (McBain can go far, far away as far as I'm concerned). With so many kids (Risto, Pysyk, McCabe, Zadarov), adding a steady older UFA d-man for them to learn from isn't a terrible idea. On that note, the only UFA I'd resign is probably Hank as a veteran 7th defenseman (although might as well resign John Scott since he won't cost anything).