Refining DOTP2013 decks

Hi guys,

Although I used to play magic a long time ago (4th edition / Ice Age days) I've been out of it for a long time, and although I'm enjoying DOTP (I played the 2009 and 2012 versions, and am having a blast with 2013) I'm having trouble working out how to optimise the decks, especially now I have 40 unlocked cards for each deck (thanks to the promo codes). Some things are obvious to remove, but then there's a bunch of good looking cards, and I really don't know how to choose between them.

Does anyone have any hints/tips for this, or lists of how they optimise the dotp21013 decks to make them better?