Looking to get a used iMac for my wife to use in combination with her iPad Pro to do some graphic design work. She does a lot of hand lettering and logo design using mainly Procreate on the iPad, but she’s finding the need to have a desktop device to do some post processing work. I found a few iMacs for sale on my local Craigslist that are within my budget (<$600), and they all seem to be somewhere in the Late 2009-Mid 2011 model range. Would these models likely be sufficient for her needs? What should be the number one thing I look for? I did notice that some have 8gb RAM, while others only have 4gb. Should 8gb be considered a requirement? Thanks in advance to anyone who can offer some insight/assistance.