The for Carnation, is phenomenal and I think it'd fit right in. Also if somehow it wasn't recommended, Spiderland. As both albums feature Brian McMahan as a vocalist and songwriter they obviously have a lot in common, though they're still very distinct and equally great—though perhaps that's a blasphemous claim.

A slightly more unorthodox suggestion is Can. They're definitely still in a similar vein and they inspired a lot of post rock, but they're also totally unique. The three albums with Damo Suzuki (Tago Mago, Ege Bamyasi, Future Days) and are rightfully hailed as their best, but their later albums are also pretty great.