I can not decide Intel or AMD.
In the first case the configuration:

ASUS Rampage II Extreme or Gigabyte GA-EX58-UD5 or MSI Eclipse Sli
CPU Intel Core i7-920 2.66 GHz

Cooler Master <RR-UV8-XBU1-GP> V8 + Cooler Master <RR-ACC-1366-GP> Retention Bracket Set LGA1366
HYUNDAI / HYNIX DDR-III DIMM 2GB <PC3-8500> X3
HDD 750 GB SATA-II 300 Western Digital Caviar Black <WD7501AALS> 7200rpm 32Mb
Optiarc AD-7220S <Black> SATA (OEM) 1 GB <PCI-E> DDR-3 XFX <GeForce GTX285 670M> (RTL) DualDVI + TV Out + SLI <GX-285N-ZDDF>
Miditower Cooler Master <RC-690-KKN1-GP> Chassis CM690 Black ATX without BP
GlacialTech <GT12025-SDLA-1(Black)> for m / tower (SMART, 120x120x25mm, 18.5 dB, 950 rpm) X4
Power Supply Thermaltake <W0203RE> ToughPower QFan 750W (24 +4 +4 x6 +3 x8pin) Cable Management

Acceleration is planned (and still is!)

In the second case:

M / B Gigabyte GA-MA790XT-UD4P
CPU AMD Phenom II X4 940 Black Edition
Cooler Master <RR-UV8-XBU1-GP> V8
HYUNDAI / HYNIX DDR-III DIMM 2Gb <PC3-8500> x2
HDD 750 Gb SATA-II 300 Western Digital Caviar Black <WD7501AALS> 7200rpm 32Mb
Optiarc AD-7220S <Black> SATA (OEM)
1Gb <PCI-E> DDR-3 XFX <GeForce GTX285 670M> (RTL) DualDVI + TV Out + SLI <GX-285N-ZDDF>
Miditower CoolerMaster <RC-690-KKN1-GP> Chassis CM690 Black ATX without BP
GlacialTech <GT12025-SDLA-1(Black)> for m / tower (SMART, 120x120x25mm, 18.5 dB, 950 rpm) X4
Power Supply Thermaltake <W0203RE> ToughPower QFan 750W (24 +4 +4 x6 +3 x8pin) Cable Management

Which configuration would be productive?