Back in January, Philips unveiled two different alternatives to address the needs of iPhone, iPod touch, and fourth-generation iPod nano users, both of which are becoming available in stores this month. One is the circular SBD7000 ($120), and the other is the wider SBD8100 ($150), both designed for affordability and compatibility with most but not all recent iPod and iPhone models. Notably, these systems both come with physical support cradles for…