Not sure where you got your info about a KLR250 not being able to hit 65mph. Mine will cruise at 75mph (GPS, not speedo) and still have some left over. True, I wouldn't want to do hours of slab on it, but it will run the 75mph speed limit here in Montana no problem. The XT225, well, that's another story since it gets really squirrely at anything over 70mph.
I would second the recommendation of a DR350 though, I'd love to find a '97+ DR350SE in good condition.