These guys are hands-down some of the best makers of footwear in the hobby today; you cannot go wrong with any of them.http://missouribootandshoe.tripod.com/http://www.robertlandhistoricshoes.com/ ... StoreFronthttp://www.civilwarboots.com/war_boots.asp
I would suggest a standard Federal bootee (brogan) with either pegged or sewn soles. Either will do and be durable and authentic. Smooth or rough out leather is always a concern for me, but I find that smooth-out is best...rough-out works fine too but you will have to blackball the shoes more often. Get heel plates, hobnails are optional at Missouri Boot & Shoe but I would highly suggest getting them. You will want to avoid civilian styles of footwear and especially boots; Federal issue bootees are the best thing to march in, dry out fast, and are durable, just what they were designed to be. Boots are hot, annoying, expensive, and not often seen on the feet of campaigning soldiers in the field.
_________________Brian WhiteWambaugh, White, & Companyhttp://www.wwandcompany.com
Randolph Mess, U.S. Sharpshooters