Hawg, et al.
I've got a pair of the Pietta 1851 Navy Marshal models - 5 inch barrel, engraved, in the white. They're purty guns, fit my hand (although I like the 2nd Gen and Uberti grip profile better), are pretty accurate CAS guns, and fun to shoot. I've also got one of the Marshals in .36 that I use as a back-up for my Navy Arms Frontiersmen.
I think most people think that the .44 will work better for CAS (ya know, those dreaded knockdowns), would be easier to load cause of the bigger projectile, and arent really that concerned about the historical accuracy part.
My regular guns are .36 cal Navies.