And for an overview here, there's a vital distinction between lists such as Deepmap, the Saguaro, RASC and TAC Eye Candy lists, and lists like the Herschel 400 and Caldwell. Those first 4 are selected for what objects look like in the eyepiece. The H-400 is an armchair list made up from the numbers by a set of nice people in St Augustine, FL. The Caldwells are just plain arbitrary.
Like TAC, right? We are the hardcore hilltop observers. Not armchair, not us.