Bluetooth dongle - interference with WiFi?

I'm after a a Blutooth dongle to connect my K750i phone to my PC wirelessly. I need one that offers the latest 1.2 Bluetooth standard and one that will not interfere with my WiFi network. The latter is critical as I have a high-speed (125Mb) WiFi network at home.

If I understand the Bluetooth standards correctly, Bluetooth 1.0 and 1.1 is likely to interfere with 802.11b/g networks but Bluetooth 1.2 is less likely to do so. Is this correct?

Are there any Bluetooth dongles that I should consider or is any dongle that complies with the 1.2 standard sufficient? I would prefer one that does not require any drivers to be installed.