I like this deck a lot. I have a red/white that tries to do similar things. http://www.mtgvault.com/ViewDeck.aspx?DeckID=284847 I wasn't aware of the existence of Felidar Sovereign or Divinity of Pride, but I think I'll need to find some now! I would consider dropping 1 or 2 Celestial Mantles in favor of Ob Rings or Pacifys.
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I would drop the Briarberry cohorts, Faerie Swarms, and Vapor Snags. Add x2 Mana Leaks or Negates and 2 Delver of Secrets. I love the Trepanation blades, although they may be a little too offensive considering the creatures you have. Maybe a Worldslayer or something similar?
I've been considering moving down to 2 Emrakuls. I don't own a Platinum Angel, but I like the idea and once I do it'll probably added. It's so hard to decide which ridicula-creatures to use! I'm also considering adding more mid-game cards, but so far I haven't had any problems...
I could really use some suggestions for this as it's my primary deck for FNM and casual. A lot of what I have in the sideboard I'm considering putting into the main deck for continuity. I worry about the late game though, so I'm torn about taking out the bigger creatures. Thanks for your time.
You might also consider a keening stone or two. They're a bit expensive, but great in late game, when you've already milled your opponent down a bit.