When launching your SEO campaign, if you have the choice of the domain then buying a keyword dense domain is important but not going to prevent you from being #1 if you dont have it.
For example, search the 1 word search phrase “foreclosure” and see what domain shows up first.
Now, that’s not showing #1 just because of the domain name, but it’s sure is helping. Now, to show you that it isn’t the be all end all to have your desired keywords in your domain name, search the phrase “Arizona Website Design.”
When it comes to purchasing your domain, if you can get a keyword dense one than that is 1 step forward in the right direction. SEO isn’t just one good thing to get you to the top, it’s a combination of a bunch of small things to make 1 good big thing. Obviously some aspects are more important than others, but usually not 1 single thing will get you to the top.