Fire temple entrance with the drakes is good. Also, that place at the end of the west branch in the kirin passage in Ilshenar where the drakes, dragons, and greater mongbats spawn, is good. My friend always lured out of that area whichever we didn't want - the 2 drakes if we were after barbed, the 2 dragons if we wanted horned. That keeps it down to 2 of the remaining "desired" type spawning in the area at a time at most, and there is running room if a paragon spawns. We had to worry about PKs on Siege but if you are playing on a regular shard, all you have to worry about is the spawn.
-Skylark