Thanks for your responses. You can view the result here: 
Summary:
https://docs.google/forms/d/13M_0E2h_PSuy5R46BFh5VUKhd9QSoHSPL5XCUgVTh18/viewanalytics
Detail:
https://docs.google/spreadsheets/d/1vvUK1R44BKkT-auu8ZA0Z0u-s0y2XcLc1E6LohxUo-Q/edit#gid=609811389
tl;dr: Build a desktop unless you need portability. Buy mainboard with new CPU socket (so you can upgrade later). Don’t buy lastest graphic cards - they’re expensive, while old models are still good.