The bar ends are really crimped? I thought "IsoZone" meant they put a chunk of rubber inside the bars and concealed it with a normal bar-end plug, like this. Though I wouldn't put it past Trek to do something dumb like crimp the end of the bars shut.
Back to your question: flat bars are mostly all the same, IMO. Just get one with the right clamp diameter to match your stem. If you want a specific make and model, I can vouch for the Titec Hell Bent XC bar that I'm still riding after many years.
If you want to get weird, the bikepacking folks seem to like Jones H-Bars and the like. They allow more hand positions and tons of mounting room for lights/bags/bells/whatever.
