You can see the test system that was used on page 2 of that review and the components are not in the stratosphere in terms of cost and are not the best of the best. The mobo they used you can pick up for £125.
An i5 processor on a decent motherboard clocked up to a reasonable speed will comfortably balance a system if going the SLI/crossfire route - which looks like the option thats been taken.
neo-ninja is a gamer so graphics are an important factor in the final system - so I'd suggest getting a motherboard and PSU combo that'll support the extra card and then the option is there of getting a good FPS boost in the future when the cards come down in price or when funds allow.
The mobo choice of the ASUS P8Z68-V LX has good overclocking capability and is actually crossfire compatible to boot, so you could add another HD 6850 if the PSU can cope with it, although tbh, you'll probably find you're happy with the system as it is.