I have Guitar Rig, Amplitube and Logic P7 and have tried many others... Guitar Amp Pro in Logic kills everything else, bar none. Remember, when going digital the preamp is still the most important factor (S**t in = s**t out as they say). If it really counts then pick up a Yamaha i88x for interface with REAL heads. With this machine you probably will not want to spoil your tone with modeling.