Should It Stay Or Should It Go

I’m suffering from a touch of GAS (Gear Acquisition Syndrome). I’ve had my iMac for over 7 years now and used it almost every day so surely I can’t be seriously chastised for considering an update. In most respects it still works well until that is it comes to processing the image files from the D810 camera where it definitely struggles. Picking my replacement iMac model is easy, if expensive, but then you have to add on the extra costs of making the legacy hardware and software work. Methinks my credit card could be about to take a humongous hit.