No-frills Smittybuilt low-back bucket seats from Summit are $129. each, and look very similar to the Bostrum van seats from the early '60s (that found their way into Mopar Super Stock race cars), and similar to the Buddy Buckets from '66-up.
http://www.summitracing.com/parts/smt-44801
I have a friend that put them in two race cars and drove thousands of HARD miles in them, and said they were very comfortable. '53 Stude in the 2,000 mile La Carrera Panamericana road race (which is brutal Mexican roads), and a '65 Mustang for the Targa Newfoundland.
I have a pair for my '57 Gasser, but don't have any seat time in them yet.
These Rugged Ridge low back buckets, also from Summit, are $148, and look a little more factory.
http://www.summitracing.com/parts/rgg-1340001
I'll be getting one or the other, and using an LMC center console with cup holders. Not the really expensive repro console with chrome trim, the plain one.
Low back buckets with a plain black console will look right in my factory K10.
-Brad