I recently purchased a marantz 4500 receiver. I got it...just before Christmas I think, so almost two months ago? I'm very pleased with it so far. I'm a bit of a newbie with this stuff, and this was my first leap into buying serious a/v stuff.
I'm not sure how the 7500 rates, but if I had to list a con for the 4500 is that it doesn't have quite enough power. The 5500 has a more powerful amp as well as component video up-converting, so I find myself wishing I'd paid an extra 200 bucks for the 5500.
Marantz just recently revamped their website, so it's a lot more user-friendly now. You should be able to find plenty of specs on it.
I purchased my 4500 at a local specialty shop for $379.
Currently the Marantz is pushing a pair of Paradigm Titans, CC-170, and a pair of craptastic Sony surrounds. I'm happy with the Paradigm speakers and Marantz receiver, and I hope to be upgrading to some Paradigm ADP-170 surrounds soon. (can you say tax refund?)
