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@PantaniAttack
http://pages.ebay.com/link/?nav=item.view&id=331370530125&alt=web
Is this the one you were looking at? Straight off, the wheels at quite a bit more budget and the groupset is heavier than Ultegra for sure.
As for ride ect 853 vs 631, I've ridden both - the 853 has got a lot more 'zip' certainly, because it's stiffer torsionally and lighter, and I'd say more confident and comfortable than 631, which tends to knock you about a bit over the distance.
That's about it. And my 853 is £450 cheaper :)