Hi Adam,
A little late to party, but BrightonSEO is highly recommended. Plus, our Director of Community, Jen Lopez, will be speaking. 
Another great one is Distilled's SearchLove - high quality speakers and great content!
I hope this helps!
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Hi there!
I agree and also recommend Followerwonk. Rand did a Whiteboard Friday on this topic last year which you can view here: Using Followerwonk to Grow Your Twitter Account.
Good luck!