I am really torn between this and a used mono SBIG ST-8300M!!
Whichever one you choose, I don't think you would have any regrets. This is a brand new camera, so you might have to go through some rounds of driver updates before it's rock solid, but a used STF might not be perfectly reliable either (oh, BTW...I think you should consider the STF-8300 rather than the ST-8300. The latter does not have a user-serviceable desiccant. I think it also has higher dark current, which might be a little problematic for NB.)