The Mac Pro is well overdue for updating, and may well be set for EOL; it’s certainly not fun to lug around!
Owing to the newer i-series chips, top-end iMacs test out faster for many operations than do Mac Pros, particularly when fitted with solid-state drives. I have a pre-Thunderbolt 21.5" iMac that I am quite happy with screen-wise, and find its LCD superior to my similar-vintage MBP’s screen (viewing angles in particular); I use the MBP with a large matte Dell in my office.
An out-of-left field option is to use a Mac mini with a decent screen; I have been eyeing the Server model (quad-core and with two hard drives).
Finally, make sure you use a calibration device that can handle LED backlighting if you use a display with this technology.
yes, a BIG +1.
At this moment, MacPro is not up to expectations, at least not for these kind of 5-7k money.
Don't forget that on any actual MacPros you cannot use SATA3 SSDs, just SATA2, so an iMac can run 550MBps per SSD, MacPro just under 300...
No good.
I understand that you use your machines for some 3D modelling. If this is more important for you, performance wise, better ask a 3D specialists forum (possibly you might need better grade video cards, in this regard iMac is indeed limited).
In my humble opinion for Aperture/Capture One/Photoshop at this very moment an i7 3.4 iMac with a RAID0 pair of SSDs is faster than a MacPro. And cheaper.
I had got to take the same decision this fall and I choose the iMac route.
At least untill Apple will decide to update the MacPro line (or choose to end it alltogether).
Also, compared to an iMac, MacPro plus a monitor is a PAIN to transport on location. I know what I am talking about, as I've used a (2007) MacPro for this kind of jobs untill I've switched to iMac.
IMO.