thinking about getting a iMac through. Scheme in my work to help paying for it. Only the 7200rpm HD version is available, is this advisable? I would have liked the fusion drive version but there is no option. II use Lightroom and fox on a retina mbp 14 model just now but most of my work files are on either my usb3 LaCie drive or my external tb drive. Would the HD version be ok? Just a hobbyist user, nothing professional.