I have a need for a 1U that will just act as a backup (higher MX) mailserver and, occasionally, deliver some large .iso images at under 10Mbit/Sec .... :) And I'm sure that there are other technically saavy users just like me that could help you out with this "surplus" space! :)

see http://www.vix.com/personalcolo/ for some places to host that backup MX. (note, i have no business affiliation with any of the entities listed there.)