I am looking to replace my 8 year old iMac with a new 21.5 inch model--not the base one. I do a moderate amt of still photo editing, net surfing, etc. all for personal and not business use. Would it be advisable to have Apple upgrade my Ram to 16 Gig? I was able to personally upgrade Ram on my present machine , but was told that is not possible on the new ones. What advantage would the extra 8 Gig provide? My son suggested the Fusion drive as well and what is your opinion of that vs. the regular hard drive or flash drive? I see that B&H has a model with a faster processor and a 256 Flash drive and I think with an upgraded video card, but I think the card supplied with the machine I want should meet my video needs. Thanks in advance for your opinions re-these issues.