I think you will find a bose-x is way way way ahead in quality and comfort of any £100 headset.
Try it.
Sure the prices are obscenely high but how much value do you put on your hearing long-term, and on your ability to hear marginal ATC transmissions?
For local flying between the creases in the map, a cheap headset might be OK but I have tried a number of them and all were basically crap. Even a £500 D-C one was very uncomfortable compared to the bose, due to the clamp pressure.
Personally I would not pay money for a bluetooth feature.