I would cut the DR by 5. I think Brawl or Slam is more appropriate than CMA. If you want to take Brawl anyway, or took it before you got bitten, I suggest taking Streetfighting to go along with it
If I was aiming for a pseudo-realistic game with supernatural elements, brawl.
If I was aiming for a high-fantasy game in the modern era (such as modern arcana), they'd go back to getting a slam attack.
If I was aiming for a Buffy or Underworld-esque action-movie style game where the vampires were bad guys, they'd get martial arts feats to represent their superior speed and strength in a fight.
Vampires come with different assumptions based on sub-genre