How do you say

This chair is really well-made, I intend to buy it.

..in Chinese?

这把椅子的质量很好,我打算买下来。

zhè bǎ yǐ zi de zhì liàng hěn hǎo , wǒ dǎ suàn mǎi xià lái 。

How do you say "I am going to buy a new sofa for the living room." in Chinese?