There are a few threads on mtgnexus about Bruna as a commander in a control-style deck that I would consider excellent resources.
I think more than anything, Angels have steep casting costs, so you're probably going to need to run any land-to-hand cards you own like
Tithe (if you can find a copy),
Gift of Estates,
Land Tax, etc. In my experience with mono-white generals that are costly (I used to play
Akroma, Angel of Wrath), it's more about hitting land drops than leveraging niche ramp cards (though, you should probably include
Knight of the White Orchid and
Solemn Simulacrum).
Of the must-have angels aside from our meld pair, I think
Lyra Dawnbringer is the only one I would want to insist on.