Many have weighed in already. There is some truth to what everyone has said. Admittedly, I haven't shopped for a receiver in years, so I'm a bit unfamiliar with specific models currently available. Otto has a great point. Although I don't believe all brands are the same, all the major brands are very good. Denon/Marantz (same brand today), Yamaha, Onkyo/Integra and Pioneer, you won't go wrong with any of them. As someone who sold hi-fi in both the Quad and modern eras, here's what you should consider:
1- Your price range. Based on the Denon AVR 1910, I'd assume under $600.
2- Connectivity. Exactly what/how many devices do you intend to hook up? What do you intend to add in the future? 6ch analog inputs?
3- Features. What's important to you? Surround/decoding/synthesis modes? Multi-zone? Ease of operation? Remote control layout?
4- Sound. You need to LISTEN and COMPARE. At the same store, with the same software, same speakers, same tone settings (neutral or bypassed), and at the same volume level, switch back and forth. Do you hear a difference? If so, what appeals to you. Use music as your demo. A very well-recorded modern recording is preferable. If you listen to any amount of classical music, use that as your demo, since it is acoustic music that will more easily reveal the accuracy and flaws (or lack thereof.)
5- Buying gear on-line sounds like a great proposition, but exchanges and tech support become dicey. Personal service can be a worthwhile value-added benefit. Many people use stores as the demo center for the on-line retailers. I question the ethics of this method. A great independent retailer is a Godsend, if there is such a thing in your area.
10 years ago, when I sold surround, I sold all the aforementioned brands. Although I use B&K seperates for my main system, I own both Denon and Onkyo surround receivers. I also own an old Marantz Quad amp. The old Quad gear had a better build quality than the lower priced (under $1000) modern receivers, though they have limitations and may not be well suited to today's digital world. Modern equipment incorporating multi-channel analog inputs can do any of the old Quad formats, with the proper tape equipment, decoders, and/or demodulators attached to it. That is the best of both worlds.