The Z1 - PERIOD
The original RAV style remote can be had on eBay, often brand new, as you already know for a good price. Power cords are easy and the manual most definitely is on their website for anyone to download.
I have had my Z1 for about 2 years now - I got it the month it was released. It has never, ever, EVER had a single issue. All channels work very well and the 3 component inputs are enough to handle HD cable, DVD, and a gaming console. Sound is loud and clean... I don't think I've ever pushed it anywhere near the 0db mark... it almost scares me how loud it would be.
The ONE downside: It is 6.1, not 7.1. Meh.
WITH a 5 year warranty for under a grand is really one hell of a deal and you should snatch it up immediately. Keep in mind that almost any online purchase of good receivers voids the manufacturers warranty.
Denon is great, but that Yamaha is a steal.