Welcome to the addiction and to Tnet My ace250 came with head phones from Kellyco so I haven't tried any others. I have seen several post on here that refer to Radio Shack carrying some if you want to go to a brick and mortar store or there are some good folks here to deal with if you want to get some online. Good luck,
Well...if you want to spend almost as much as you did for your detector, try some Killer B's or Grey Ghosts. If not, try a set of Koss headphones. The most important thing is that they are designed if MDing.