In reply to owlart:
I have a fancy pair of Sennheiser over ear headphones (Momentum 3) and I'm not sure they would manage 10m, but it depends on the source as well as the headset. They do better connected to my phone than my work laptop. Is the dongle attached at the front or back of the PC? If the back, moving to face more into the room may help too.
As a decent, fairly entry level over ear option you'd be hard pressed to beat the Sony WH-CH520's at around £40-£50. They have some nice touches, like connecting to two devices at once, and claim a range of 10m with line of sight. There is a cheaper model, the CH510 but they apparently have issues around a sound passthrough feature.
Post edited at 13:41