Need some advice here. Right now i am running Mac Pro 3.1, I don't need much more as far as processing power goes but i LOVE having 4 internal HDDS running. 1TB SSD boot drive and 6 TB iTunes library, both of these drives are cloned inside the mac pro making up all 4 of the HDD spaces. I looked into replacing the Mac Pro with a used 5.1, would be a pretty seamless process as i would just need to swap out the HDDS for the new machine. Finding stuff on Ebay around $1,400. Only negative I had with my mac pro is all the wires, i run 2 27 inch monitors. I am considering buying a new 27 inch iMac, which would take care of the cords problem but i would lose the ability to have internal hard drives and both of my monitors would be useless so if i wanted a 2nd display i would need to buy a Thunderbolt one I think. For the iMac I know i could get a external hard drive enclosures but I would be subject to USB or Thunderbolt. Again processing power isn't a priority to me as my current machine can handle what i need it do, I just hate having a machine that doesn't allow for the most recent OS. This isn't something I need to rush either since my machine works fine and i am not dying for the new OS.