I have a late 2012 21.5 inch iMac. It's the base model ($1299) and I know that at some point, Apple will release new models powered by Intel 4th Generation Processors, known as Haswell. With Apple likely holding an event on September 10, I am trying to decide if that's the date when the new models will come out. I have had it for 8 months and it is in very good condition. If I am including everything, and it looks 100% like new, how much could I get for it, but also, should I sell it now in preparation for September 10? Thanks!