I just found a 16 core mac on the UK refurb store, either that or its one hellofa typo
http://store.apple.com/uk/product/FA970B/A
page says its got;
Two 2.8GHz 8-Core Intel Xeon processors
2GB (2x1GB) of 800Mhz DDR2 ECC fully buffered DIMM
320GB Serial ATA 3Gb/s drive @ 7200rpm hard drive
16x SuperDrive (DVD+R DL/DVD±RW/CD-RW)
ATI Radeon HD 2600 XT 256MB
and its only £1499.00 inc VAT and free delivery.
http://store.apple.com/uk/product/FA970B/A
page says its got;
Two 2.8GHz 8-Core Intel Xeon processors
2GB (2x1GB) of 800Mhz DDR2 ECC fully buffered DIMM
320GB Serial ATA 3Gb/s drive @ 7200rpm hard drive
16x SuperDrive (DVD+R DL/DVD±RW/CD-RW)
ATI Radeon HD 2600 XT 256MB
and its only £1499.00 inc VAT and free delivery.