I'm helping my dad sell his Mac Pro, and have no idea what it's worth. I know that people buying machines like this are going to be much more inclined to customize their own box, so we know we'll likely take a substantial loss. Here are the specs, straight from System Information: Hardware Overview: Model Name: Mac Pro Model Identifier: MacPro5,1 Processor Name: 6-Core Intel Xeon Processor Speed: 3.46 GHz Number of Processors: 2 Total Number of Cores: 12 L2 Cache (per Core): 256 KB L3 Cache (per Processor): 12 MB Memory: 64 GB Processor Interconnect Speed: 6.4 GT/s NVIDIA GeForce GTX 680: Chipset Model: NVIDIA GeForce GTX 680 Type: GPU Bus: PCIe Slot: Slot-1 PCIe Lane Width: x16 VRAM (Total): 2048 MB Vendor: NVIDIA (0x10de) Device ID: 0x1180 Revision ID: 0x00a2 ROM Revision: 3731 Storage: 2x 2tb drives 1x 1tb SSD It also has a USB 3 card. Since this thing is so far from stock, I'm struggling to come up with a price tag. What does Macrumors think?