My colleagues in Shanghai currently use Qunar as a starting point for their bookings, and they are almost always able to beat ctrip (sometimes by y30 and sometimes by y200). But, there is often some sort of mandatory travel insurance tacked on, and the companies selling the tickets are almost always really small (i.e. there is no way in hell that you can call them at 9p and expect to be rebooked on a different carrier). That having been said, if the price difference really is y350, I will consider ditching those guys.