ATi Crossfire vs Nvidia SLi

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If you go for ATI and multiple monitors, you need a active Display Port adapter(not included with the cards from what I notised )

Here is a list from AMD: http://support.amd.com/us/eyefinity/Page...ngles.aspx

Not an issue if you have monitors with DP connection though

one 6870 got the option to connect 6 monitors(think the 6900 Series will perform better though): http://www.guru3d.com/article/radeon-hd-...0-review/4

If you plan on running multiple monitor setup, I reccomend a Card with as much memmory as possible(2GB or more), since the more resolution(amount of monitors) demand more memmory

Hope I was helpfull

NB: Remember getting a solid PSU for the computer, heavy load on GPU + overclock needs "juice"