North Star West makes a British officer's fusil that is an exact copy of one in the Smithsonian. these are VERY high quality. Matt Dennison is the owner, and he will bend over backwards to please you.
I have one of those and can vouch for their quality

some highland units in America used a lighter musket instead of the standard 1st and 2nd model bess
they were also used by NCO's


I, too, have heard many nightmare stories of dealing with The Rifle Shoppe, but it has gotten better in the last couple of years. The problem is, they don't keep all those thousands of components in stock (except for common types, like "Brown Bess") but have them cast (from original parts) upon receiving an order....
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I have a friend that waited for two years to get the last piece of the wall rifle kit he ordered from the rifle shop