Got some new domains

I decided that it was time to register some new domains for Project Designs. So went out and got projectdesigns.us, projectdesigns.biz, and theprojectdesigns.com

Now the big question is which one should I promote? All of them, including the .org that I already use, will all go to Project Designs. But which one should I promote in emails, business cards etc.

I’m thinking theprojectdesigns.com just because it’s a .com. What do you guys think? Which one sounds/looks better?