I received one of these for free, in essentially new condition. It's still entirely stock, and specs are as follows: Two 2.66GHz Dual Core Intel Xeon 5150 processors 8.0GB (4x2.0GB) PC2-5300 (667MHz) DDR2 ECC fully-buffered DIMM, supports up to 32.0GB 250GB Serial ATA hard disk drive @ 7200RPM DVD-RW/CD-RW SuperDrive-DL NVIDIA GeForce 7300 GT 256MB GDDR2 memory 2- Dual-link DVI ports 5- USB ports 2- FireWire 400 ports 2- FireWire 800 ports 2- Ethernet ports 4- PCI Express (PCIe) expansion slots (video card installed in one) It lacks Bluetooth and an AirPort Extreme card. Can either be added at this point? How far can I upgrade it, and what upgrades are recommended? Is this model even a viable option for use in 2016? Any advice would be greatly appreciated!