I have not heard anything bad about corsair, and it does seem unlikely that they will degrade in a matter of months, though the more stressed the RAM is the shorter the life span, but we would still be talking significantly more time than a few months, as long as you of cause dong super over clock them :)
Other good "gamer"-memory producers would be OCZ and GeIL. Hope you find some RAM-modules that you will be happy with :)