Thankfully, Parts generally carry the same part names worldwide.

Q6600 - Retail comes with a stock fan.
4GB DDR2 PC6400(+) RAM
Nvidia 8800GT - (s)(x)(Ultra) - 512MB or above.
Large HDD, etc.

If you are using diffrent sized monitors, then Vista is definately going to be better for you.

Additionally If you *really* want to add more than 2 monitors to the system, then going for an SLI machine will be beneficial. A quick word on SLI. It doesn't help WoW frame rates, so, once you get it, disable SLI mode and run them as independant Graphics Cards.

Are you intending to purchase a PC or are you going to build it yourself?