I just purchased Photomatix and already have PSE5. Photomatix only allows to save to JPG, BMP or TIFF. I don't know which file is better for manipulation purposes, BMP or TIFF. If you tell me what you think and why I would be eternally gratefull. Okay, not for eternity. Probably a shorter time than that. 
2 Samuel 9:7-8, "So David said to him, “Do not fear, for I will surely show you kindness for Jonathan your father’s sake, and will restore to you all the land of Saul your grandfather; and you shall eat bread at my table continually.” Then he bowed himself, and said, “What is your servant, that you should look upon such a dead dog as I?”