Hi, I'm putting together a system for audio/visual use that needs to run cool and quiet under a desk. The CPU will probably be an i5 6400 (65W) and I'm looking for a cooler (air or water) that will keep this happy and run as quiet as possible for less than £50. I'd also prefer something that won't obscure any RAM slots. I've had lots of success with Noctua coolers in i7 systems, so my first thought was the NH-U12S but I'm wondering if there's anything as good or better for a bit less money? Cheers.