Corsair is a reliable and respected brand within the industry and amongst enthusiasts. Speak to anyone who builds systems for themselves/family/friends, and you'll soon find out that they are using a Corsair PSU - or have strongly considered it before opting for another brand, usually based on financial or other very specific objective considerations. It's true that there are more factors to consider than mere brand, but in this case, I would say that buying a Corsair should give you an indication of a high-quality, reliable and efficient solution.
EDIT: and I will go on the record for you and tell you that whenever I dealt with Corsair's customer service (at work), they have provided world-class service. So yes, they take your money with a smile, but they provide support with a smile too (figuratively) and any company like that is A-OK in my book!