I am considering upgrading my iMac to the next generation if it comes out soon. I am debating between the base 21.5" model and the high end 27" model and everything in between both new and refurbished. I was thinking about just getting the base model because I feel like it would depreciate the least amount over time when I eventually want to sell it and upgrade again. Let's say the base model ($1,199) goes down by 25% in value in three years and the high end model ($1,999) does the same. This would mean a 300 loss in the base model and a 500 loss in the high end model. Does anyone else overanalyze their purchase like this? Thanks for any advice.