Can anyone recommend to me a good pair of sports headphones that stays in the ear well, doesn't stop working when exposed to sweat, and has at least decent sound? I do most of my training without music, but I tend to bring an mp3 player along maybe twice a week and my current headphones suck. I'm looking to spend somewhere under $75 or so unless there's something truly incredible for a little more. I've heard good things about Sennheiser's sports line, but their stuff is typically pretty pricey and I want to be sure they're going to work well before I buy, so can anyone comment on that?