Help with Linuxlab

Hi, I'm looking for a Linux lab computer or one for general everyday tasks, browsing the internet, watching movies, studying, etc. I was considering void Linux and gentoo, and then in the distant future LFS I don't want to pay a lot for the computer and I'm asking for help, is a processor with 2 cores and 4 threads enough or is it really better to pay the extra 50$ and buy a laptop with 4 cores and 8. And 8gb ram will be enough?