System76 is probably the most well-known Linux laptop distributor in the US, their offerings are pretty popular. I know a few people with one of their laptops and all of them are pretty satisfied.

Purism is a bit more "extreme", trying to create an all-libre laptop that avoids proprietary software and hardware. Once their equipment is a bit more stable it's something I'm going to look into more, for now they're still in development though.