Which brand of laptop has a very good quality but cheap in price?

My dad is looking for a new laptop but he really doesn’t know which one brand to buy. I’ve always bought HP laptop/computer but my dad wants a Dell but he doesn’t know if it’s good or not and he saw that the price is expensive.

So which brand of laptop has a very good quality but still low in price? He wants a 15” screen, hardware has to be more than 1GB and in between the price range of $600 to $700.