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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
I _really _doubt that you'd see any negative effects from having one hyphen in the domain name. Google is trying to discourage domains like www.best-office-space-in-nyc-new-york.com—that is, spammy, keyword-stuffed domains. Of course, I can't make any guarantees on that, but I'd be pretty surprised if that one hyphen caused any noticeable trouble.
That said, you may want to just check on the domain sans-hyphen, if only so you can sleep a little better. 
I wouldn't worry too much about the TLD.
Honestly, having an exact-match domain is really only an issue when it's part of an over-optimization or spam issue—if the brand name is "Metro Manhattan Office Space, Inc." then metro-manhattan.com seems like a perfectly reasonable domain name. I sincerely doubt that you'd see any negative effect.
Of course, you'll need to keep in mind that you'll have a lot of competition on the SERPs, including from sites like mta.info (DA 88).
Make sense?
I agree with the sentiment here, Moosa, but know that PA and DA do take link quality into account, and they won't necessarily go up when you get new links. There's actually a huge number of factors that goes into calculating those metrics. (Check out our overview of Page Authority here, and of Domain Authority here.)
For example, both metrics consider MozTrust, which measures the inherent "trust value" of linking sites. So to use a pretty simple scenario, if you gain a few links from less-trusted (but not necessarily bad) sites, and lose one link from a very high-trust site, you may actually see PA and DA decrease.
It's not unheard of for a high-trust site to go offline and drop the DA and PA of any sites it had linked to, as well as sites those sites link to. That's one of the reasons that we generally recommend using DA and PA to benchmark yourself against your competitors rather than as an absolute measure of your "rankability." Make sense?
Just wanted to set the record straight. 
Might've gone a little endorse-happy there, but the three of you hit all the points I was going to make.
Hi All!
It looks like Dev Dan asked a follow-up question here, if anyone can help him out.
http://moz.com/community/q/gtm-migration-from-old-to-new-verison-as-old-version-closing-on-1st-april