Unfortunately for your budget you are not going to able to find any speaker with speciality in house engineered transducers except a great pair of headphones. Sorry to disappoint you but your budget is firmly in mass market speakers with outsourced parts - perhaps if you look vintage used then you may find something.
That said mass produced speakers with parts from Seas/Peerless and others increasingly all from China can be quite good - so don't feel bad.
That said mass produced speakers with parts from Seas/Peerless and others increasingly all from China can be quite good - so don't feel bad.