It is definately NOT a Donzi. But is it a Cmate (23' Enforcer) knockoff? The bow and sides look right but the transom and splashwell are not correct. It might have been a I/O 23 that some one hacked up into a O/B model. I know my Mates pretty well but not sure about this boat. None the less, not a very nice boat.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160065529380
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160065529380