Water pump rebuilds

[Fredb_]

When doing a complete engine rebuild on a worn out flathead, It's obvious one would replace or rebuild the water pumps. I have the two matching pumps that were on my 81a 24 stud motor. Would I want to get these pumps rebuilt, or buy a set from a good rebuilder? I have seen threads on here about special pumps that are being sold and touted to give better cooling. Any words of wisdom for me on this? Thanks!