Shiloh makes great guns, but advertises alot, sponsors events more, gives away guns for prizes, and seems to therefore get most of the press. C. Sharps are usually not as fancy as far as options go (but the price can still add up), I think the main benefit of the C. Sharps is that they use Badger Barrels, which are tops for BP and cast bullets.
Regarding sights...due to the rather curved trajectory of the big ctgs.,the best bet is a std. blade front sight and whatever barrel sight you prefer, and set it up for 100 yds., a vernier rear sight can be used at the same time and set it up for say, 200yds.. this set up works for a hunting gun....for a target gun, I would suggest a good Soule Vernier tang sight and a Lyman #17 front sight w/inserts as a minimum. Don't scrimp on these rear sights as some of them have a lot of slop in their adj. and you don't need that variable to contend with.