Hello, I stumbled across this recently: https://www.raspberrypi.org/products/raspberry-pi-4-model-b/ I can use some guidance and advice from folks who have experience with Raspberry Pi's. What I read so far looks good but I have questions. If 'you' were to use a Raspberry Pi as a desktop replacement which one would you recommend? Is there a major difference in response times between the 4Gb and 8Gb models ? How hot does the unit become ? Does it require an add on fan shim ? Or will work fine without one ? How easy or difficult would it be to boot off an external hard disk as compared to the SD card that comes with the Pi ? Any other things to watch out for and be aware of before I purchase ? Instead of buying the kit would it be cheaper to buy each item separately from different vendors ? Thanks - Aruna