If you want to Buy Magic Cards, the next set you purchase should be the Divine set.  The cards are still plenty powerful, and you can easily win with this set.  However, during game play i have noticed that people do not get as upset when you take them out using the Divine deck.  It probably has something to do with the angels.  Akroma–The Angel of Wrath is probably the rarest card in the deck, and has wonderful powers.  Of course if you do not mind being a bit demonic, go with the demonc deck.  As long as you win, that is all that really matters.