Whether you want to run Mac OS X Server or standard OS X, this is a great machine. You can find full specs at Mac mini "Core 2 Duo" 2.66 (Server) Specs (Mid-2010, MC438LL/A, Macmini4,1, A1347, 2364) @ EveryMac.com
This computer has been upgraded with 8GB memory (from standard 4GB) and has extended AppleCare coverage until January, 2014. It is complete with box, install discs, manuals, Server license Key (Important!).
One important difference with the Server version of the mini is that in addition to greater disk capacity, it has faster drives (7200 rpm, instead of 5400 rpm).
Asking $750. I would much prefer to sell to a local buyer in Ottawa, but will consider shipping.
I will consider offers less than $750, but not for a week or more.
Apple still sells a refurbished version of this computer with less warranty (1 year instead of 21 months) and less memory (4GB instead of 8GB) for almost $850 (after Ontario HST): Refurbished Mac mini 2.66GHz Intel Core 2 Duo - Apple Store (Canada)