I use a Marantz AVR in my family room, an Integra AVR in my HT room, and an Onkyo pre-pro in my main 2 channel system. Here's my take...
The primary difference between these brands IMHO is that Marantz includes Audyssey XT in the 7005, while the Onkyo and Integra alternatives at the same price point (IIRC) upgrade you to XT32. Assuming that your installation includes (a) subwoofer(s), this alone would drive me to the Onkyo side of the fence. XT 32 is the real thing. (It's just great for seamless subwoofer integration and DRC) However, there are also mechanical quirks around the Marantz that give me a little concern. You could probably Google "Marantz protection mode" for a description of one example.
Denon also offers Xt32 equipped receivers, but I'm less familiar with those.
Good Luck.
Mary
The primary difference between these brands IMHO is that Marantz includes Audyssey XT in the 7005, while the Onkyo and Integra alternatives at the same price point (IIRC) upgrade you to XT32. Assuming that your installation includes (a) subwoofer(s), this alone would drive me to the Onkyo side of the fence. XT 32 is the real thing. (It's just great for seamless subwoofer integration and DRC) However, there are also mechanical quirks around the Marantz that give me a little concern. You could probably Google "Marantz protection mode" for a description of one example.
Denon also offers Xt32 equipped receivers, but I'm less familiar with those.
Good Luck.
Mary