Cocoaheads Ireland and Northern Ireland
Sorry John, not really sure what kind of server do you want?
Why do you need OS X hosting for apps development? Can you specify bit more detailed your requirements (source control/wiki/bugtracker/iCal/etc...)?
I agree with John. I used to have a MacminiColo and if you weren't using a decent connection it was useless. I would imagine every other solution involving a vnc or screen sharing connection would suffer from the same latency issues.