My i5-2500k was being cooled by an Artic Freezer Pro 7 CPU cooler up until the point that the fan attached the heat sink failed and since the CPU is overclocked to 4.0GHz I need a replacement CPU cooler ASAP. What is the best CPU cooler for an LGA1155 socket (don't really want the same one again since the temps the CPU was at was worrying). I don't really want to spend more than £40.