personally , i think imac late 2017 is the last batch of imac that is worth-every-penny kind of thing . mine was i7 , 16gb , 27'' with 4k reso . walao really nice and space-savvy .

HDD-wise , there always a room for upgrade incase ure short of storage , or get urself some portable/hdd dock to store your prev vlogs.

imho , the latest version sucks , plus damn expensive .

here i attach some advert from mudah for u to gauge the price for 2017 version
https://www.mudah.my/IMac+5K+27+inch+Late+2015-75429645.htm

eh , for me i do coding on xcode ,

donno for ts usage how later ah

goodluck ts