Yeah, Rhythm is one of my bad ones too (confession; I spelled it wrong here the 1st time
I like the idea of using your last name and totally agree that it will be easy to remember.
Since you will be redirecting the old URL to the new site, you can still use all the business cards. I would just prominently display something to the effect of "Rhythm Virtual Solutions is now Romero Virtual Communications" (or Romero Virtual Solutions - unless Communications is what you do).
I say that because I am one that gets freaked out if I go to one site or URL and I am redirected to another with no explanation and I always approach business from the standpoint of me being a consumer also (i.e how would I feel if?).
Just a thought!