I love the BarMitts (pogeys) to keep my fingers warm with normal bike gloves.
I cheat and put some plastic or saran wrap between socks+shoes just in the toe area in my too-snug ventilated bike shoes.
Make sure you have toe wiggle room. Really cold days I'll wear soccer socks (need the extra calf width)
Balaclavas are awesome. I have a fleece one from Performance. Cool days I have a thin fleecy beanie cap.
Safety glasses are nice.
Moisture control is the hardest for me. Even if my skin is cold, my core can get plenty warm so I sweat. It's hard to balance on long commutes with stops, hard uphills (sweatmaking), fast downhills (breezemaking), shade vs sun, traffic (warmer), rural (cooler).
Really cold days I've worn cycling rain pants over the tights and was warm but sopping wet.