Rpadge

I had a similar decision to make and decided a new computer was the best option. While upgrading memory, hard drives, and video cards will get you some nice gains, its still an older computer with a likelihood of another part failing (motherboard, power supply etc), then what? Assuming this is how you make your living, the prudent option is to plan on replacing your hardware every 3-4 years or so. You might be able to extend that with periodic, specific upgrades, but I wouldn't go past 5-6 years, I think you are asking for trouble if you do.

+1 for Dbox

I would buy a 1070 graphics card as a minimum.

I would consider upgrading the memory (32 gb) and graphics card.

There are barn doors available for download from CA https://3dlibrary.chiefarchitect.com/index.php?YII_CSRF_TOKEN=57c398c0e73e01ae525a3730f24de2d22a3edeed&r=site%2Flibrary&search=barn&x=0&y=0&x=true&hid_cpca=0&hid_cpu=0&hid_ctm=0&hid_ctnm=0&hid_ctu=0&hid_order=&hid_norotator=false&hid_soft_family_1=0&hid_soft_family_2=0&hid_soft_1=0&hid_soft_2=0&hid_soft_4=0&hid_soft_5=0&hid_soft_6=0&hid_soft_7=0&hid_soft_8=0&hid_version_7=0&hid_version_6=0&hid_version_5=0&hid_version_4=0&hid_version_3=0&hid_version_2=0&hid_version_1=0

CA definitely need to look at adding the ability to do keystones, brick soldiers, jack arches etc. automatically