With price tags that are less than a third or a half of D5’s, it shouldn’t come as a shock that these systems are not sonically equivalent either to Creative’s high-water mark or each other—but given that the D100 can be had for $65 and the D200 goes for only a little over $100 online, they’re extremely appealing. Both work equally well with iPads, current iPhones, and current iPod touches. They each contain Bluetooth…