Ok, I connected the Wii via component and RCA audio to the receiver. Played Super Mario Galaxy 2 for a while, no problems so far, the sound it's good too. Easy configuration.
Also, I tested the 60GB PS3 again with Avatar for more time, with HDMI, also testing different audio tracks, no problems so far, no black screen, 1080p. When changing the tracks, the receiver detects the correct audio format, this is done using bitstream.
All these tests took me some hours, the receiver is working fine for now. No hard reset needed.
However, it gets hot after while, but this is normal (as stated in the manual and the top sticker in the receiver). I will buy 2 PC fans to put them on top, one blowing down, the other blowing up.
I will try later some PS3 games, but these shouldn't have any problems, since most games only runs at 720p, taking less bandwidth.