What Magic the Gathering preconstructed deck should I get?

I am a new magic player and don't want to spend too much money on making a deck so I am buying a preconstructed deck. I don't want to get an intro pack because they are pretty weak. I bought a New Phyrexia fat pack so i have a good lot of cards to add some to a precon deck. I was thinking of buying an event deck or splitting a duel deck with my friends. Im thinking of getting 2 Knights vs Dragons duel decks and combining the two knight decks to make an awesome deck and my friend would do the same with the Dragons decks. Is that a good idea? What is the best and most fun preconstructed event or duel deck out there? As a last resort for the extra money, my friend and I were going to buy a Elves vs Goblins duel deck, I would get the Elves, he would get the Goblins but we would have to pay about 60 bucks each, is it worth it?