I am looking to upgrade my receiver (so I can pass my H-K AVR 320 down to my son).
Usage is mainly music, 80-20, 90-10 to home theater. My H-K is rated 65 in stereo mode, it is clear and there is no clipping when cranked up, but on occasion I would like a little more juice. (I listen to mainly blues, jazz and all types of R & R )
My Speakers are Athena AS F1.2's, C1.2, BIC DV62si's with EFE modified crossovers for surrounds. I have been using the BIC's in the front for a couple of weeks and found them to sound a bit better than the Athenas, so I am considering buying 3 EFE modified DV62CLR's for the front. My sub is a Polk 12" that came from a T-I-B, not real powerful but adequate for now.
My budget for a receiver is $1000, these are the ones I have narrowed it down to:
Harman Kardon-AVR 3550HD, since I have an H-K and like it I like I feel warm and fuzzy all over about this one, and am comfortable with the on screen display. If it had the USB port and a little more power like the Marantz there would be no indecisiveness on my part.
Marantz SR 6003, I trust Marantz products, my parents had an old receiver from back in the early 70's (maybe late 60's?) that was a great unit until lightning killed it a few years back. The USB port is a very attractive feature for me, I have an extensive MP3 collection and a bunch of thumbdrives that I use in my Kenwood car audio receivers.
ONKYO TXSR876, I had an Onkyo surround receiver back in the early 90's and was very happy with it until the day the ex wife made off with it.

This one is rated 140 watts so that has more than I need, however I have been reading that most of these run very hot, and the lessor models have problems with the video chips in them. (which is why I picked this model, it has a different chip)
I prefer a warmer sounding system which is why I have the H-K and Marantz as the two I am considering most, Yamaha and Denon have a lot of complaints about the manual and GUI so I haven't considered them.
Any thoughts?