Love the in-ear headphones
I, too, have a set of Sony's that I just LOVE.....they're the $49.95 ones at the Apple store, Target, etc. -- The only problem I have with them is that they're short on one side and longer on the other, which causes them to sometimes pull loose with activity. The sound is great, though, and while not truly noise-cancelling, I do fly a lot, and I'm pleased that they drown out the "plane drone" fairly well.
I also have the Apple ones and love the quality, but they fall out when I'm mountain biking.
Most anyplace has at least a two week return period so you can try them out first.