I use a late 2012 iMac 27" i7 at my work for graphic design....but other than than software use, I'm pretty oblivious to hardware pros/cons and I'm looking to purchase an iMac for home use. I've done some research, but much of the technical language is over my head. My primary purpose will be graphic design using the Adobe Creative Suite but I will also be doing music recording. No gaming or coding, but the possibility of light video editing is there. Also, I have an external hard drive that I'll store most of my work on. My question is, what do I NEED? I'm considering the basic $1800 27", which is pretty close to the top of what I can afford. Do I need an i7 over an i5? Is the SSD the right choice over HDD? It comes with 8GB but my understanding is it is pretty easy on the new models to add more....? Any input is welcome. Thanks!!