Help finishing sound room w/ Vandy 5a

I was wondering if I could summon your opinions on carpeting a suspended wood floor in this 23 x 12 dedicated audio abode. Is there any truth to all wool carpet being sonically superior to nylon.... I went to the carpet store today and they had a good evenly dense (not too thick) pad but the wool carpet starts at $2400 bucks. This is around 50 % more than a good quality dense nylon rug. I also am considering laying down 1/8 or 1/4 inch ( I have to confirm exact thickness) machined metal under the pad where the Vandys will sit on. Thanks in advance for all your help and enjoy the music.