MB,
My BuckMark has a TruGlo reflex type sight on it that I like very much.
The sight is less than $100. Has two color choices and several brightness levels.
From a bench, I can work over a soda can at 100 yards pretty easy.
TacSol ( IIRC ) has a great combination scope base/rear sight mount that I used.
I sighted in the rear irons first, then the reflex in case I find I need to run w/o the optic for some reason.