Those temps at those clocks with the cpu and cooler you have SCREAMS that something is not right. I know all chips are different but my 2500k is sitting at 4.7GHz with 1.34v and I never go above 75*C with a cooler which is not quite as good as yours. I would personally try a re-mount of the water block with new paste and make sure it's all fixed down securely.
Temps maxing at 72 now, after 5 hours test on P95. That's 44 m/plier and 1.2 cpu voltage.
Also fixed an annoying buzz from a fan.
I've got £200 max to spend on a graphics card now, anyone got a suggestion?
Was thinking maybe one of these; http://www.overclockers.co.uk/showproduct.php?prodid=GX-174-MS
looks like youve had more than a few troubles during the build,but im sure you will be relieved its done now,im currently saving maniacally for a xmas build which will be my first ever,hope i get done as well you have