How are cooler master psu ??

Here a link to Johnny Guru's web site; A search under cooler master turns up several different models that he has tested. Mixed results, but generally o.k.
http://www.jonnyguru.com/
Some of the early Cooler Master PSU's were not very good, but they have made a concerted effort to improve their products.
Shop carefully, read reviews (not just on the merchants web site) of the one you are interested in and then make an informed choice.
At present the top quality brands/manufactures are Seasonic, XFX, Corsair, PC Power&Cooling, Antec, Rosewill CAPSTONE series.
This link should also be helpful:
http://www.eggxpert.com/forums/thread/323050.aspx
and another
http://www.tomshardware.com/reviews/power-supply-oem-manufacturer,2913.html
 
Yupp.. that is right, the RM series also is said to be extremely quiet, also has flat cables which are plus for cable management.

Also below 40% load the fan does not run at all which makes it of course quiet.

They are 80+ Gold and the best of all they have Modular cables.

I am not sure how I almost forgot about the RM series.