Selfish Pizza

I've been playing Rocksmith for years on Xbox and want to now make the transition to PC as there is no new DLC for Xbox. Can anyone recommend a Laptop to use for (mainly) Rocksmith/CDLC. I don't know too much about computers and I'm struggling to understand what the specs that are needed compared to current laptops. Ideally I want something for around £500 that other people have used for Rocksmith so I know if definitely works, as I have read people have issues with sound lag with some computers. Any help would be gratefully appreciated. Thanks