So my 2007 MBP died and I'm looking at getting a midrange new iMac 21.5. I want to bump it up to 16 gigs of memory, fusion drive and Apple care. My question is I see folks going with just 8 gigs of memory doing labor intensive stuff. I just surf, blog, and write sermons/lessons and video conferencing. Do I need 16 gigs? For my mobile side I have an iPad 3 and Note 10.1 2014. Thanks for any help.