I had the chance to buy an iMac (top of the range one for half price...) but I didn't rush to do so.
The current machine is 522 days old like you say. The current design runs very hot. The HDs take alot of hammer. I've certainly had problems. You wouldn't put keep your hands on the top left side of an iMac while it's running even a moderate game for long.
We're due 8 gigs of ram and 2 gig gpus. Cooler running design. Quad core across the board. i7 as standard and dropping the i5 to the entry level.
...and I'd like to see Retina. Such that it will be.
...and solid state drives are dropping in price. Should be standard in the top model at least.
Lemon Bon Bon.