When I'm running, after a certain point of exhaustion I don't pick out the details of my music so much.
I would recommend the Sony EX-85LP, this is assuming you won't be using it with an armband, because I think it's harder to buy a legit Short Cord model due to the fact most stores carry the LP, and whatever SP models exist on Ebay may be fakes.
Sound quality is reasonable, rather warm presentation imho. These are not full isolation earphones, so you'll get some noise reduction but still be able to hear what's going on around you. When I had them, they blocked out enough noise, but I could hear my surroundings.
They were comfortable enough for me, and didn't pop out of my ears while running. Durability is so so, but you can get it for under $25 at Amazon Marketplace. So these can be a cheaper pair of cans you can use just for running, overall SQ is acceptable.