Any good laptops for programming?

My current laptop is lenovo with 4 GB RAM and it is really slow. I’m looking buy a new laptop for programming only. Any suggestions?

– I use Atom code editor
– I’m going to work on React, Node.js basically javascript

Is 8 GB RAM enough or should i go for 16 Gb or more? Which kind of GPU and graphics are good? Which brand is cheapest?