The newcomer in my second studio: the Red House Studio.
The center of my studio. Love the huge glossy display, minimal design, plenty of power. I doubled the ram in it, and have never had performance issues. My DAW is Logic Pro 9. I've thought about a Mac Pro instead, but there's really no need!
Great machine, excellent processing ability. Make sure to back up on at least three different mediums though, our hard drive had a melt down and needed to be replaced. Definitely utilize Backblaze (or cloud backup), external hard drives, dropbox and time machine. It cost $2k to recover all of our data. Apple made us pay $500 non-refundable to have the HD back to recover it from a third-party. If you need to recover, we definitely can recommend Secure Data Recovery.
Make sure to use an external HD for all of your samples, and run the software on the machine. Even though we were already doing this, it still crashed on us. Mac Pro will be the next computer for us, and hopefully better luck. We actually have two iMacs - one from 2013, and one from 2014. We use the new one for video work, and it has a Fusion Drive, which seems to correct the HD from having the archaic meltdown in the first place. Definitely spend the extra money for the Fusion Drive. Aloha!