keywords in url

How important are keywords in the URL? Let's say I have a domain called BHWStuff.com and I want to rank for "BHW Topics". Let's also say that BHWTopics.com was taken, along with BHWTopics.org and BHWTopics.net. Will BHWStuff.com be a little bit harder to rank than BHWTopics.com? There was an...