I'm considering getting an imac as I'm planning on doing 1080 HD film editing as a regular hobbie, specifically dive videos (1.5-2hrs raw footage per week). Now from my understanding the 21.5" is exactly 1080 HD, and the 27" is significantly bigger. So how much of an advantage is it having the extra screen space? Is it like: A) "I suppose it's nice but it's really not necessary" B) "Really handy to have, makes a big difference" C) "WHAT ON EARTH ARE YOU DOING BUYING AN IMAC TO DO 1080 HD FILM EDITING WHEN THE SCREEN IS ONLY JUST 1080 HD!?!?!?!?!?!?!" The reason why I'm not immediately jumping for the 27" option is that, as nice as it is to have that massive screen space, I haven't got loads of spare money and I'm a uni student, so my income really just covers living costs. I could get it by selling some shares, but... yeah. Not preferred. Also, I'll try wait for the refresh to come out before I buy. More cost effective that way.