If I were willing to spend extravagant funds on my PC peripherals I would start with Art. Lebedev’s Optimus Maximus. The Optimus Maximus is a 113-key keyboard in which each of the keys is an OLED allowing dynamic icons for all keys. Coming in with a price tag of roughly $1,500 it is creme de la creme of input devices.
Engadget has an older hands-on (with delicious photos) while Arstechnica has a more recent hands-on from the ongoing CES