I'm looking for a mid-level set of ear buds to supplement my Senn cans. I figured I'd give noise canceling a try, since they're mostly for traveling and sound isolation tends to interfere with listening to announcements and the whatnot. Can any of y'all that own these give me your impressions? If I can pick them up for $70, am I going to be happy with my purchase or will I feel like I've wasted my money? Not looking for top-grade sound quality; again, they're just going...