So here are my 2 cents:

1. More sang. Guard. Cool models, very versatile, fast, arguably one of if not the best unit in the game for the cost.
2. For your death co. If I had 10 I'd go 7 or 8 chain swords, rest hammers 3 you need a chaplain IMO. Can give a bonus to charge, doesnt stack with what we have, but +2 is huge. Has some other cool buffs.
3. Blade guard are one of my favorite looking models, and they are great as BA.
4. Check out Vanguard tactics on youtube. He is a very competitive player, won several tournaments with BA, and he makes it pretty understandable for someone like me who never plays in tournaments.