This is very personal choice... The integra has all the bells and whistles...while the marantz doesn't.. In terms of sound quality, the integra sound is more on the neutral/bright zone while the marantz is on the warm side....
I liked the sound of the marantz better than the integra's and this is why I chose it...
The only issue is that if you want to hear the advance audio codecs from Blu ray (DD+, dolby true hd, and DTS HD MA), it will be better if you have a BD player that can decode them. The AV8003 can decode but it turns off the audyssey, which is critical in my own opinion....