Already purchased the 2500k just down to personal opinion and what 750w power supply would you recommend modular if possible for £85 or lower?
the xfx xxx 750w is around 96 pounds but it is more efficent and quieter than the standard 80+bronze.
heres the linkhttp://www.overclockers.co.uk/showproduct.php?prodid=CA-001-XF&groupid=701&catid=123&subcat=
theres virtually no diference between the z68 and z77 chipsets other than the z68 is a bit older. either one works and is just as good. id go with z77 as the manufacturers tend to add more new features that the last generation didnt have