All of them are good drippers and would make a nice first purchase. Out of the three the Magma might be the toughest to build starting out but I really like the one's I have. Deep wells and great flavor! The only one that you can build a single coil on with AFC is the Zenith, the other two you have to play the "hold the fingers over the hole trick" and the Magma is all dual coil unless you like it airy.
Like I said, any one of those three are a winner.