Hi all, I’ll order iMac through corporate plan. Regarding both the base and top models of iMac 27”, if both models are upgraded to 512GB SSD, then the price difference between both models is $230. In other words, $230 brings: i5 8600 —> i5 9600k Radeon Pro 570X 4GB —> 580X 8GB Questions: Is it worth to spend $230 to have the above upgrades? Further upgrade SSD from 512GB to 1TB costs extra $180. Shall I spend extra $180 to upgrade to 1TB, or to keep 512GB with external SSD? Thank you so much for your help!