i have a 27 inch , 2.8 i7 , 12 gb ram ,1TB hard drive imac early 2010 model, i usually upgrade my computer , selling the old one every time there is an refresh. how ever i didn't upgrade my 2010 imac with the new imac 2011. my question is should i wait ? is next refresh any time soon? what is the big different between 2010 and 2011 imacs? sorry i am not a technical person. ill be buying from apple referb store.