Some interesting opinions here, much appreciated.
What are you trying too cool? and it what case/airflow?
Is it 1366 i7 OC that you need a Mugen 2 or Noctua NH14D in push+pull? How much heat do you need to get rid of? If its anything lower than 130W TDP you should rethink the dual fan setup IMO.
Mugen 2 with 1 fan can cool most CPUs and do so quietly. That would have been my choice given the price difference. I thinks Mugen 2 includes Silmore thermal paste (it sucks!!). AC MX 2/3/4 is much much better.
My CPU is an AMD Athlon II x6 1090T 3.2Ghz, 125W TDP and a P183 case. I'm interested in trying some overclocking although it will be my first, so I'm not sure if I'll be doing much of it or not. If the cooler is not up to the task of running it within temperature limits on an OC and still be quiet I'll probably not be overclocking it much.
BTW: every CPU heatsink I've ever purchased came with thermal paste.
Yes the Mugen 2 comes with thermal paste, but I've yet to hear anyone say something nice about it. Thus I didn't consider buying a Mugen without spending money on a better paste.
If you do decide to go with 2 fans on the Mugen, 1200RPM is too high. The bundled Slipstream PWM is rated at 250-1300 RMP and isnt gonna get to more than 500-600 on your typical motherboard control. You want the second fan to slower to start with, and the ability to under-volt it even more to 500-600 range. Maybe a Slipstream 800, or S-flex 800. 2 matching Nexus 120s would be ideal.
Interesting but also disappointing, I was hoping to just add another Slipstream 1200rpm as it is the only SPCR recommended fan available in my country and are reasonably priced. The Slipstream 800rpm, S-Flex and the Nexus are not available here.
As for the alternative coolers suggested here, unfortunately none of those are available to me locally.
I think maybe getting the Mugen 2 and MX-3/4 paste would be a smart choice. It's far more economical and judging by your feedback it may just be enough for me. I can then add to it if I feel it's not enough and still end up under or around the D14 price it seems.