I am in the market for an iMac and have decided on the 21.5” 4K one, but want to get some advice on which model and year to buy. We will be using it as a main hub for all of our music and photos, web browsing, some video/photo editing (very light nothing crazy intensive), and some audio editing as well (also nothing intensive). There are other uses for it, but those are the main ones. I know for sure that we are going to need at least a 1 TB Fusion drive for everything. Anyways, I was hoping for some input on whether I should go ahead and get the 2017 version with the 1 TB Fusion or if I should be looking for a used 2015 version that could possible have better specs? ANyone have a suggestion or some information that could help me? Thanks everyone!