As cool as a seperate site would be, I'd opt for just staying on DA. I've set up websites on several occasions. They have a way of eating up all of your spare time!
Think of it this way, time you'd be spending dealing with the website is time you no longer have to be working on your comic! You DA account is already set up and your fans all know to look for you here. So why make more work for yourself and have less time for your art?