I'm looking for an effective lightweight headest to use in the CRJ. A couple that I'm considering are Telex ANR 500 and Telex ANR 850, priced at $490 and $446 respectively. Are these any good? Is the 850 good enough considering it gets its power from the jacks, not batteries? Is there a better one that is inexpensive? Thank you for any feedback from people who have used them.