I just placed my order for a 27" iMac about a week ago. The only upgrade I ordered is the 1tb fusion drive. I have enjoyed my current iMac now for over five years and it feels like it's a good time to replace it with a shiny new model. My current iMac has a small screen (not sure of the inches). I'm still feeling a little unsure about ordering the 27" due to the large size and the cost. I'm trying to justify this in my head because if I keep this Mac as long as my current one it may make more sense to spend the extra cash and get the better specs. As for the screen size, I hope 27" on my desk doesn't feel over powering, kind of like having too large of a TV in a small room. My order is still processing with a delivery date pending the week of Feb 8th. It's not too late to cancel, but I'm sure I will love having the new model as there has been huge strides in technology over the past five years.