A much better "boxer gone MMA" would be Jens Pulver

http://www.dailymotion.com/video/x8a...vs-jens-pulver

He fights Gomi here, who is considered by most to be far and away the best LW MMAist in the world.
Pulver (I believe) is running away with the fight until he catches one. But regardless, Pulver is what a Boxer turned MMA should look like, and proof of how deadly boxing can be when properly adapted.