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I wouldn't use anything else for PR's! Best of luck with everything!!

I agree with Sheena.  A focus on the domain name as a brand is so yesteryear.  And what's worse, having an EMD makes it almost impossible not to have it stand out as brand-like.  These days, when I see them in the search results, I'm skeptical and will often click on something else just to avoid them.  While I may not be typical, there may come a time when such is typical.  In fact, I don't preclude a future where it may be better to move to a brand domain name and 301 the EMD to that . Absolutely focus on the brand and forget the domain. That will be helpful to you in the long run.

OSE doesn't have the resources to crawl as deeply as AHREFs, Majestic, etc., so the index is smaller. Get your backlinks from multiple sources for the best picture.