Depends on your budget..
Corsair 600t
Intel i7 980X
24 gigs of 2000 ddr3
EVGA 4-way SLI classified
4 GTX 580's
C300 256GB SSD
Antec 1200 watt PSU
Far too overkill, in fact you'd bottle neck the CPU with that much RAM
Case: NZXT Phantom
CPU: Intel Core i7 950 3.06GHz and overclock to 4GHz
Mobo: Asus Sabertooth TUF x58
RAM: Mushkin 6GB Redline Ridgeback Triple Channel 6-8-6-24 timings.
CPU Cooler: Noctua NH-D14
Primary Drive: Mushkin Calliston Deluxe 80GB SSD.
Secondary Drive: Western Digital Caviar Black 1TB HDD with 64MB Cache.
GPU: EVGA GTX 570 or 580
PSU: Corsair 850watt Modular
ROM: Any SATA based ROM drive.
This system is sufficient enough for many, many bots and is an excellent all round machine for gaming and general office use.
PS. Before any says that nlr was being sarcastic let me point out I was as well...