My old Onkyo 575 is on the fritz - intermittantly not recognizing dolby digital signals and also shutting down due to overheating fairly frequently (used the same setup for years with no over heating, now the reciever shuts off everytime there's an explosion or other loud full range noise). Any way, I'm looking to upgraded but money is a factor. I've got my eyes on the Onkyo TXSR603 and the Marantz SR4600 and I'm wondering if anybody has any strong opinions one way or the other. I use my system for probably 50% music (5 channel stereo) and 50% home theatre. I use paradigm speakers with monitors & a CC370 up front, a PS1200 sub, and titans in the back. Right now, i'm leaning towards the onkyo because of its higher power and powered 2nd zone feature. Anyone have any strong feelings one way or the other? I've never used Marantz stuff - is there a big quality difference?