And on the topic of the Tactical Shotgun, I know I'm probably speaking blasphemy here, but I don't consider it to be that much better than the combat shotgun to be a definite no-brainer. Sure, it deals more damage and you don't need to pump, but I find that in the early game, enemies don't move so fast that pumping makes that big of a difference in your killing power. In the late game, I do most of my killing with a double-shotty in corner shooting position, relegating the combat/tac shotty to auxiliary roles, like taking out lone lost souls/formers.
Making a focused double-shotty therefore becomes a better choice for the mods. A focused DS allows me to change my playstyle, letting me come out of the corners into the open. The Mortuary is doable with nothing more than a P-modded focused DS, and you'll get an assault shotgun there anyway if you really want one. If I have the mods to make a focused double shotty after the armory, I'll hold on to them until WK2 and make do with a combat until I can assemble one. Usually I'll find a second tech mod, that goes on the CS. A tech-modded CS is really an under-appreciated weapon, the increased fire-speed makes up for the pump, producing a weapon that fires almost as fast as a tac shotty without using a precious power mod.
Edit: Looking at the Wiki, a tac shotty fires in 1 second, whereas a combat shotty fires in 1 sec with a .2 second reload time. A tech mod cuts fire time to .85 seconds, meaning a T1 combat shotty can fire and pump in 1.05 seconds. If you have WK1 or 2, you may want to think about just putting the mods on the CS without turning it into the tac version.
