Peasant.
I don't know how anyone can use 70gsm or less, it's practically see through. I refuse to even let the kids doodle on it lol.
We use Navigator (a Portugese company) coated 80gsm pure white for throwaway stuff, and ultra 120gsm for anything more formal. It's a bit more expensive at around £4 for 250 sheets, but the quality is spot on and the 'coating' infused into the paper means the toner adheres perfectly and I haven't seen a paper jam since we switched.
Edit:
Just checked to be sure (I got curious) and it's the Universal 80gsm or Expression 90gsm (depending on stock) we use daily, and the Presentation (100gsm) or Colour Documents (120gsm) we use for anything more formal. Great paper. The best. Trump approved.