I've upgraded from an i5-2500k at 4.2 (hyper 212 plus) to an i7-6700k at stock (Noctua NH-L9i). I'm thinking about delidding and picking up a beefier cooler. I've found some delidding services on ebay but I was wondering if anyone knows of one in London that offers a reasonable price so that I don't need to pay for and wait for 2-way shipping. What is a reasonable cooler for reaching 4.5-4.6 that is reasonably priced? I know the Noctua NH-D15 is the best but I'm not paying £80. I also want it to fit in SFF case when I get my HDDs sorted and finish my ITX upgrade. Low idle noise is a priority. I don't care as much when I'm gaming as long as it is reasonable.