I need a new iMac. I currently have a mid-2010 21.5" and it's been great for over 4 years. If I buy a 2013 21.5" with fusion drive and 16gigs of RAM, it's $1899. If I buy a refurbed 27" with fusion drive it's faster, better graphics and I can upgrade the RAM myself, and, for $1869, a better buy. The only thing that makes me hesitate on the 27" model is that the display is, well, 27". I just came from the Apple Store to compare them in person (it had been awhile), and am debating whether I could get used to the larger model, because it just seems enormous. I'm wondering if anyone has purchased the 27" and returned it, just because it was (for them) simply too much screen real estate and they could not adjust to it? I'm worried that the size of the display would be a distraction. Thanks.