I currently have a 2011 27" iMac that I upgraded to a 256GB SSD with 16GB ram. I'm not a heavy user, but I need things to work instantly. I would like to upgrade to a new machine with a retina display that has the same user experience with things loading instantly. I'm initially looking at the entry level 27" 5K, but it has a 1TB Hard drive, not a fusion drive or SSD. I'm worried I'll be losing responsiveness and sacrificing loading times. I'm also looking at a late 2014 model from B&H that's on sale for $1699 http://www.bhphotovideo.com/c/product/1086734-REG/apple_mf886ll_a_27_imac_with_retina.html This one has a fusion drive so I believe it should provide the level of responsiveness I expect. I'd like to spend around $1700 but I'll go higher if I need to in order to get what I need. All advice is appreciated!