#1. "RE: Which of the following brand names is more catchy for my startup?" In response to Reply # 0
Have you thought of something simple and direct like "William Web Design"? If you have a specialized focus in mind, that can also help with these things.
Personally, I think "Webacado" is the only one of these that sounds catchy. The others are a bit generic, and they'll do fine, but if you're going for something plain, I like to go the direct route (see "William Web Design")