The processor in particular. Are the four CPU options all the same socket type / same motherboard architecture/ compatibility? I have seen statements regarding this issue as well as responses claiming the contrary which is confusing. Generally mainstream computer hardware drops in price drastically after a period of time, but since the hardware components for the nMP are mostly unique perhaps getting parts cheaper later on is unlikely. Due to the huge discrepancy in price between the four CPU options I can imagine some of the owners of this machine would be interested in an eventual upgrade to lengthen the usable life of their computer or simply make it more capable when it is affordable. Your thoughts? Knowledge? Recommendations?