I think it is safe to say you can build it cheaper yourself and know that every part you buy is. What is the RAM? What kind of 1Tb Harddrive is it? What kind of PSU have they used? Motherboard? Can it XFire/SLI? Is it SATA 6/USB 3.0? Sorry, I gues some of these questions are answered in the link that I cannot see.
i7 860 is ok, but the way I see it you either get an i5 750 or you step up to the real i7s (920 etc), the 860 is a place with no real home (not that it is bad, just not worth the money).
If you are gaming you would probably stick with the i5, if you do more then you would get a Bloomfield i7
Idk where you shop for parts put you can get i7 930, gigabyte ud3r, g.skill pi 6gb, HD 5970 for bout $1400 USD or I think 1100 euros from new egg, add in other parts like hdd, odd, etc and it will probably equal 1300 euros give or take lol.
I use www.scan.co.uk as I live in England.
My biggest concern is the brand of RAM, I could live with it not being the best latency, or even not 1600mhz (though I would feel cheated given how good powerful my system would be)...but if it is some unknown brand my worry is how stable will it be? How long will it last?
Also, was the PSU a proper brand? Really don't want that being shoddy and damaging my parts.
The reason your own build hits 1200 before anything else is added is because if you go i7 Bloomfield route you have to pay for much more expensive RAM, much more expensive motherboard and a more expensive CPU.
If you were to downgrade to the i7 860, your RAM and mob would be cheaper and you can probably build a computer better or at least the same (but with quality parts) for the same price as they are selling.
But the reality is, if you are essentially using it for gaming, the i7 920 (plus mobo and RAM) is a bucket load of money being spent on negligible fps gain.
Meanwhile the i7 860 is much cheaper due to using P55 mobo and dual RAM, but again, its performance gain over the i5 750 is nothing. Especially given how easily and how well the i5 Overclocks
Given the difference in gaming performance between the i5 750, i7 860 and the i7 920/930, if any of them are bottlenecking the 5970 then they all are.