RPi is a joke, like Ckolivas said why run thousands of $$$ in equipment on a $ 40 device,(use a bit of logic) get a real hw like a netbook ,laptop, desktop, which ever with a linux distro like debian, CentOS , Fedora or Ubunutu . The RPi is just not meant to used this purpose , aka controller the SD card which is quite slow to begin , also has a limited amount of writes which always leads to failure .
I've been using my Pi as an ASIC controller since June 2013. It has been rock solid. Just make sure you use a high-quality USB power supply. I do agree that the SD card 'limited writes' is an issue. Roughly every 3 months I need to replace my SD card or at the very least re-format and re-flash it with a fresh image.
ill link here to the same article i did in the megabigpower bitfury thread on setting up your pi to run off a flash drive as the main storage and only using/tapping/touching the SDcard for bootup.
if youve got any questions hit me up and i can help. been using a pi in this config for past month as controller for my rig listed below. not a hiccup,dropped share, conn problem etc. rock solid