OnlineVirusChecker.anything has a strong feeling of a scam. Maybe some scammer woud be interested (sorry being this direct)
DesignWebsiteOnline sounds good, especially with .com, but I cannot give a price estimate, since I am quite new in the business.
OnlinePHPEditor.com is also ok, but at least for me, it has a little bit confusing letter combinations. Although writing it after understanding the meaning is rather doable.