So I am looking for advice on how to move to a mac pro from a PC. Specifically how to do so on a budget. It needs to be a pro because I need at least 1 free PCI-e slot for my DSP card and I'd like the video card to be good enough to play modern games using fusion/bootcamp. It also needs to be super quiet, as its main use is in my recording studio. I'd rather not shell out $2500+ on a new one, so my thought was to look for used, but I am not sure what gen/specs I need to go looking for. I am a software developer by day, and have built many many workstations and servers over the years so I am comfortable performing any necessarily upgrades a used box will need. Also, I have an SSD and 2TB Raid 5 array I can throw in to what ever I pick up as well. Thanks!