I am trying to decide which version of the 2018 Mini to buy. Could someone help me with some questions? 1. Would the 3.6 ghz 4-Core feel more snappy than the 3.0ghz 6-core if I never use more than 4 cores? 2. Is the SSD user upgradable? Apple wants $400 to upgrade to the 512GB SSD on the 4-Core. Very high price. 3. If I got the 4-Core, could I just add a Crucial 16GB RAM SIMM for $145 to make 24GB or do I need to take out the Apple 8GB SIMM? Apple is more expensive for less Ram. ($200 for 16GB total) 4. Is it fair to say the 4-Core will run quieter with less fan noise than the 6-core? The last time Apple put a 4-Core in a mini it couldn't handle the heat and the fans were always at full speed. 5. Which I-Mac model matches the 4-Core Mini in terms of CPU/GPU performance 6. Which I-Mac model matches the 3.0ghz 6-core in terms of CPU/GPU performance You could spend $1700 bumping up a 2018 Mini out so I am trying to control the cost. Right now I have a 2017 MacBook Pro Retina 15" with 16GB Ram and 512GB SSD so I would like to match the Ram and SSD in the Mini then sell the MacBook Pro. Thanks..