For indoor lenses, I love the True Spot. Totally "new" concept of aiming for me, but once it clicked, haven't wanted to change. There are some other similar lenses and concepts, but my preference is the TS. I like the 6x the best. Have lenses in both the 1/4" and 3/8" grinds. Prefer the 1/4".
For scope housings, big fields of view aren't necessary. Currently I am using a Classic large scope housing. Has approximately 1 1/4" fov. My biggest concern is getting the housing to center in my peep, with the size of peep I like, for the different lighting conditions that exist indoors.
Sight bars are a personal preference too. Currently I am using an Axcels, which I haven't had any problems with, and like better than the others I have tried, which include Toxonics, Sure Loc, Copper John and Shibuya. Doesn't mean any of the others are bad, I just prefer the Axcel.