I have the D2000s and have heard the Beats Pro briefly. I was surprised that they didn't sound that bad, really. They were definitely bass heavy, but not in a horrible way. Still, the D2000 is superior in almost every way, and measurements seem to back that up. Considering I got my D2000s for $250, and the Beats Pros were $400, there was no contest. Now, at the same price, I would still easily recommend the D2000 over the Beats Pro, but it really comes down to personal taste in the end.
Here are the measurements I'm talking about, by the way:
D2000
Beats Pro
The D2000s have a nice full, dynamic, fun sound with slightly boomy bass (can still be very tight and punchy), slightly recessed mids, and sparkly treble. It's not quite neutral, but it's also closer than a lot of other headphones. They have an awesome soundstage for a closed headphone. You'd think they were open headphones! I haven't heard many other headphones priced around $250, but I'd say they're some of the best headphones you can get around that price.