would be nice to change socket and try some multi GPU setup ( never had one)
Intel Core i7 3820 Quad Core 10MB 3.6GHZ
Corsair Cooling Hydro Series H100I CPU Cooler
ASUS Rampage IV Formula ATX...
he want single monitor gaming, jsut get a 3930k and a GTX 690 with 16GB of ram, if it's interesting to you and want some serious help i can make you a list of parts.
No need to spend 8k if it can cost you 4-5k. Except if you want to go...