Honestly not a whole lot of token production, baneslayers and avengers will get you there, but will definitely have a tough time. http://mtgvault.com/EditDeck.aspx?DeckID=99983&DeckCardID=2519086 We run a very similar deck, but I'm a big fan of win conditions.
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Quest for the holy relic works GREAT in this deck, I've got a buddy that wrecks face with something very similar. - Titans, Cobras, Baneslayer's + Argentum, Kor Skyfisher, Glint Hawk, quest, and beastmaster's ascension. It's a different Idea all together but, with 4 different very common win conditions on the table it's very hard to beat.
I'm a big fan of lifelink in here, I usually find myself over 50 life no problem in my aura deck, especially if they're chump blocking my Spiritdancers :)
http://www.mtgvault.com/ViewDeck.aspx?DeckID=94313 I've run 3-1 if not 4-0 for the past couple of FNM's with this deck, and I'm still working on getting some cards that I need. I usually find myself with over 50 life, and with a full hand.
I honestly think having four canopy covers is a must in this type of situation, Jace 2.0 will bounce a buffed out creature and think nothing about it. I do think you should drop the gigantiforms, as they're good, but you should have no problem at all getting any other creature to an 8/8, especially with 5 mana. I imagine this deck has trouble flowing, and you probably rarely have what you need in your hand. It's just too expensive to be able to do what it's supposed to. I say lose the Lanowar Elves, and the umbra mystics. I've ran with them before, and they only seem to slow me down.
8x Lightning bolts? YES PLEASE!