I don't usually listen to music when I ride, but I'm planning an 1,800 mile trip in a couple months and I can't spend 30 hours on the road singing to myself.  I've tried some different IEMs in the past, but everything so far has popped out when I put my helmet on.  I'm looking for an inexpensive...

I have never owned any sort of expensive headphones; probably the most money I've invested was $30 for a pair of Creative Labs earbuds.   I love music, but I've never been able to work a pair of really nice headphones into my budget until recently.  To give you a rough idea, I can spend up...