Hi! I have a 2017 27 inch iMac (EMC 3070) with a 1TB fusion drive. I'm wanting to upgrade the storage, and thinking: Upgrade SATA III to: Crucial MX500 2TB (3D NAND, SATA, 2.5 Inch, Internal SSD) Upgrade the PCIe to: Samsung 970 EVO 250GB M.2-2280 SSD Does this seem a good plan? I reckon I can put the OS and apps on the faster 970 drive this way. Is there any problem with heat from the 970? Also I'm in London, anyone know a good priced and reliable service for getting this done? I'm assuming I might be saving money if I buy the drives online and just pay someone to install them, and install the OS. Anyone have advice on best place to buy? Amazon, ebay (safe?)? Also, anyone know how much SSD the 1TB fusion drive has? I figure it's worth upgrading that to the 250GB, since it's only around £70, but if anyone has better suggestions or thinks that's not worth the bother...? Many thanks!