EDIT: Pulled a +2 dagger of electricity off an Orc Wizard. I assume that beats a rapier of speed by a large margin for stabbing, so what should I keep my eye out for next, or should I just start dumping enchant weapon scrolls onto this?
Quickblades my friend, wait for quick blades.
They have higher base damage than daggers, they have a higher attack speed, and they get the same stabbing bonus. Be warned that they are very rare, meaning you'll only have them in the late-game unless you're super lucky.
Also, enchant weapon scrolls don't really matter that much for daggers. If you're doing it right, you should only be using a dagger for stabbing. Your stealth and weapon skills have magnitudes of a larger impact on stabbing damage than enchant weapon scrolls ever will.
If you have to actually fight enemies head-on, switch to a shortsword or rapier (once you reach minimum delay on those). Of course, this last bit of advice is invalidated if you have superior brands (only electricity, distortion, and chaos count for this btw. Damage bonus from fire and freeze are negligible for shortblades) and enchantments. Electricity is one of the best brands in the game for shortblades though, so your dagger is probably gonna be your go-to weapon for now.
Quickblades are the best shortblade period. If you are ever lucky enough to find one, dump all your enchant and brand weapon scrolls on it. They are the best weapon for both stabbing and head-on combat.