Yeah, you may go through tons of gear before you settle on things. I ran Surefire Scout lights on my rifles until I saw the light of Modlite. I run Surefire on my Glock and shotgun. It just depends. You also have to think about your own practical application and expected use. As far as range gear/tools, I don't take much. appropriate wrenches for my rifles and a multitool and some lube. I do this with my rifles too.
Small bit of lube, spare batteries for my optic and light, allen wrench to remove optic, small copies of my tax stamps for that rifle, and my old multitool. I do keep a pocket cleaning tool with cleaning rods for the suppressors because they crud up quick. But honestly, your tool collection will build itself based on the products you have and need.