I had the exact situation like you. I ended up getting the Pro due to same reason as yours too. For me, I tried both and I can't feel the different on the sound quality(I'm not an audiophile) so I go for the built quality. Just that the pro is slightly heavy and I feel uncomfortable after an hour or two. But then I think it is time to put down the headphone.
If not constraint by budget, then imho, should go for the Beat Pro.

Disclaimer : Again, this is an opinion from a non-audiophile.