Thanks so much, I appreciate the response!
One thing I thought of was that Adwords in particular would require my display URL to match the final destination domain, so maybe I should be using the keyword phrase as the primary?
Then again, putting the company name in my display URL would be a good branding tool so I'm fairly mixed in my opinion of that.
Another question - would you put both domain names on your business card? (Even though they both go to the exact same web site?)
Any other comments?