I'd start with Missouri Boot and Shoe or Robert Land. Mattimore Harness is right up there too. I think most would agree they're among the best makers around today. Yes, your are correct. Pegged soles cost the government more per pair than sewn soles. And, without actual documentation, I'm pretty sure sewn soles were more common.
"Grumpy" Dave T.
"Biggest problem is, at most "reenactments," nobody knows what their "historical" job was. And, in most cases the privates are worse off than the NCO's and Officers." - Deceased