iHome’s new AirPlay speaker iW2 ($200) thus faces two serious challengers directly out of the gate: its older brother, and Philips’ Fidelio SoundAvia, another good model that recently saw its own MSRP drop from $230 to $200. But iW2 is a worthy competitor in its own right. Cosmetically almost identical to the iW1 and possessing most of the same features at a lower price point, iW2 reminds us a lot of the iPod mini’s once-controversial…