I am a singer, and want a headset to train my voice, record and listen too. What is the best use of these to test voice, vocal training, listening, vocal recording Sony MDR-V6, Sony MDR-7506, ATH-M35, ATH-M40fs, AKG K121 and Shure SHR440 .... and which is better in general. Which has the best sound? Can you tell me what is the best voice in the range of $ 100. Thank you!