The dummy loads are basically pointless. If you do decide to run one, make sure you put it in the front circuit, otherwise you will be putting extra strain on your brake light system, making the brake lamp switch live a short and unhappy life.
With LEDs (the real ones, not drop ins) at both ends of my car, I can completely agree with what Josch is saying. I used a solid state flasher until I converted the rear, then I just unsoldered the capacitor that is in the flasher and soldered in a smaller one. My signals flash just as fast as OEM, but draw ~1 amp with the flashers on. Lets see the dummy load do that!
The flasher cost about the same as a dummy load (cant remember), and the resistor to change it when I modded the rear was under a dollar. Just food for thought.
