Go for corsair and do not ever use cooler master psu.
What's wrong with Coolermaster PSU?
I still have 6 Coolermasters GX 750W PSU bought in summer 2011 running non-stop without problems.
After running ATI 6xxx videocards with them and then upgraded the rigs with ATI 7xxx videocards.
When GPU mining starts to die, I use them to power Asiminer block erupters with Logilink UA0096 powered USB hubs.
The power adapters that came with those hubs sucks and died within 2 months.
With some tutorials I found on this forum, I modified the powercables from the adapters and use the Coolermaster GX 750W PSU to power the Block Erupters.
The only downside I notice was that I have to use 3 Coolermasters GX 750W PSU to power 120 Block Erupters instead of 2.
After powering the Block Erupters, I use them to power BFL 60 GH/s Singles.
2 Singles per GX 750W and they are running non-stop since begin september 2013.
Those PSU have only been jobless for less than 2 months.
I keep my gear dust free and that solves a lot of problems.
I even bought a bagless vacuumcleaner just to clean my gear, no one touch that vacuumcleaner.
It may not be used for anything else than cleaning computers.
To save time, I use the vacuumcleaner in combination with Air Dusters.
I am using 240 volt.
Equipments are place in a dry place that I try to keep it as clean as possible.
Cheaper brands are not less reliable than expensive brands if you keep your gear clean.
Expensive brands mostly used better components that withstands better abuse, but if you treat your gear well,
you will enjoy the advertise 100000 hours MTBF of almost every PSU.
I have OCZ ModXStream Pro 600W
Coolermasters GX 750W
Everything older than 2.5 years
Corsair CXM 750W PSU
Corsair CXM 500W
Coolermasters Elite Power 400W
Coolermasters V850W
Coolermasters V1000W
Be Quiet Darkpower pro 1200W
Everything older than 4 months
Be Quiet Darkpower pro 1000W
After highly been recommend by CYPER, I bought a bunch of EVGA Supernova G2 1300W.
Those EVGA are cheap, goodlooking, sexy and I think I will enjoy it for a long time as long as I treat them well.
Everything less than 1 month.
Everything is working fine, I have never RMA a PSU.
Only RMA 1 AMD athlon because of a bug in windows 7 in combination with GUIMINER, CPU was alway 100%.
It died after 2 weeks of mining in summer 2011.
After that, I install windows XP on almost all of my rigs without that 100% stressed CPU bug.
RMA 1 ATI 6970.