So now that I'm getting back into playing on a more regular basis and will likely start attending some AVR drafts, I wanted to put together a black and white angels and demons deck that I can assemble over time through the drafts.

What I have thus far can be found here: http://deckbox.org/sets/170499

I'm thinking the mana-curve is far too slow. I've included Gideon's Lawkeeper, Royal Assassin, and Thraben Doomsayer in the hopes of generating fodder humans and otherwise providing some deterrents to slow the game down until I can play one of the many angels or demons that would turn the tables in my favor.

I'm thinking the deck really needs some sort of mana acceleration (which there aren't much of for white) or additional control spells, but those would come at the cost of removing some of the angelic or demony goodness.

Thoughts?

I had a similar idea before AVR and ended up going the EDH route with Kaalia of the Vast as my commander. Either way I think you're on the right path. The angels and demons cost a lot of mana so you'll need to deploy stall tactics. Or, you could go B/W/G for ramp.

I was thinking of trying for some dual lands for black and white to help make sure I have the right colors all the time, but damn they're pricey. Is it because of Sorin or why are those duals more than pretty much any other color combo?

Yeah, I think they see a lot of play. Frites, tokens, esper spirits... Lots of decks.