So I have the chance to buy a brand new in box 3.2 GHz iMac for $1,250. These retail for $1,700 at apple, but I was wondering if this model was really worth the price. I can get the 21" model for around $900 slightly used, and being a noob when it comes to desktops, I'm not seeing the inherent benefits of the 27" other than screen real estate. Someone please enlighten me- is this a solid buy? The refurb of this model is only $1,439, which seems low compared to the retail. Anything up with this model? Thanks