I've been planning on a new Mac Pro, but many of the reviews are less than stellar. I'm debating getting a 2013 refurb iMac for half the price....Are any of you using Lightroom, Premiere CC, Logic X, or After Effects on a souped up 2013 iMac? I only shoot HD now...
I do professional video editing and photo work using LR, Photoshop CC, and FCPX on a 2013 iMac 27 with 3.5Ghz i7, 32GB RAM, 3TB Fusion Drive and GTX-780M. Main files are on an 8TB Pegasus R4 RAID 5 array. It works fine for that, but I work collaboratively with other editors using the same software on older Macs. They get along OK, although it's somewhat slower. Still others run Premiere Pro CC on prior-generation Mac Pros and MacBook Pros. They do fine.
I don't use AE or Motion, since my co-editors do that using either Motion on a 2011 iMac, CS6 AE on a Windows machine or CC AE on a prior-generation Mac Pro. However all those are usable and present no problems.
We just edited a HD video project a few weeks ago consisting of 330GB (many hours) of 1080p multi-cam footage, ending up with a 12 min. final product. This was done on the a 2011 iMac 27 with 3.1Ghz i5, 16GB RAM, and Radeon HD6970M (1GB) and it did OK. The slowest part was the initial import since that system had no SSD, RAID or Fusion Drive. A 2013 iMac with a faster disk subsystem would have been even better, but the 2011 iMac was adequate and did not interfere with the creative process.
My main suggestion is get either SSD or Fusion Drive internal storage, and put your main files on a high speed external array. However even that is not mandatory. Lacking an array, at least put the video files on a 7200 rpm AC-powered external HDD. Or if your files are small enough and you have SSD or FD, you can use the internal drive for quite a bit.
The 2013 iMac has another big advantage: if you are exporting or transcoding to single-pass H.264 or MPEG-2, FCP X uses Intel's Quick Sync on-chip transcoder. This is several times faster than software or even GPU-assisted methods, and is not currently available in the new Mac Pro. I don't know if Premiere Pro CC uses that feature.