2013 Mac Pro 6-core for $3175
If you need a larger SSD, OWC has up to 2TB internal SSD upgrade for the 2013 Mac Pro. The D300 GPUs are just fine for most everything, but MPG recommends the 32GB or 64GB memory kit (up to 128GB possible). Add a Thunderbay 4 for main storage, two backup drives for clone backups, and you’re “good”.