Shokan,
if you're on a budget $1000-1500
CPU: Intel Q6600
Mobo: any p35/p45 Intel based boards that has 5+ SATAII ports (see HDD below)
GPU: ATI HD4850
RAM: 4 gb (namely: Crucial, G-Skill, Corsair, and Kingston)
HDD: 4x 250/500gb harddrive in RAID 10 (depends on how tight the budget's are) RAID10 (STRIPING and MIRRORING) is the best setup for any workstation purpose machine. STRIPING improves your overall data performance and MIRRORING creates an exact copy of whatever you have just in case one of them crash and burn
PSU: 600W+ power supply from any here (Corsair/Thermaltake/SeaSonic/PCP&C/Coolermaster/Silverstone)
HS: do get a quality aftermarket heatsink for your CPU namely Zalman 9500/9700, Thermalright Ultra 120, and many others, do make sure their compatibility for LGA775 socket.
CASE: any that can house lots harddrives will do.
P.S. any $$$ buy you a happy meal, better yet, buy me one too
if you have $2000-$3000 to spare:
CPU: Q9450/Q9550
Mobo: ASUS or Gigabyte x38/x48 boards
GPU: (2x) ATI HD 4870 in Crossfire X
RAM: 8gb (of any brand name mentioned above)
HDD: 4x 750/1000gb harddrives (in RAID10 again..)
PSU: 1000W+ power supply (from brands mentioned above)
COOLING: liquid cooling system namely: KOOLANCE maybe?
CASE: a SilverStone TJ series that people recommend for in use with a liquid cooling system.
P.S. any $$$ left over get a ASUS Xonar sound card works similar to GPU - takes the load from your CPU for better overall performances...
if you use cash for napkins....
CUP: QX9770
Mobo: an Nvidia SLI 790i chipset board that costs at least $300
GPU: (3x) Nvidia GTX 280 (for triple sli-though buggy but talking about bragging rights here...)
RAM: 8gb Corsair Dominator DDR3 1800
HDD: (4-8)Fujisu 300GB SAS drive (im not even sure if you can run RAID10 on this now, with or without you are running on 15000 rpm rockets... you are flying already)
PSU: 1000W-1200W PSU (any above)
COOLING: well you can do Phase Change here (any other suggestions other than maybe liquid nitrogen?)
CASE: you really deserve a custom made case here... anything commercial is just cruelty.
gl
b