Home Theater Receivers - 400 to 1,299 Dollars

When it comes to audio capability, the RX-A1010 is rated to deliver 110wpc (20Hz-20kHz at only .06 THD with 2 channels driven), and features extensive audio decoding and processing capability, including TrueHD, DTS-HD Master Audio.

However, audio isn't the whole story. The RX-A1010 also has eight 3D-compatible HDMI inputs and dual HDMI outputs along with analog to HDMI video conversion and 1080p upscaling. Extra bonuses include Internet Radio and Zone 2 audio and video connectivity and control, as well as a front mounted USB port for direct connection of flash drive, iPod, or iPhone, and Bluetooth connectivity via an optional dock. You can even download a free AV Controller App for either iPhone or Android Phone. The RX-A1010 can satisfy just about any home theater setup need, and is definitely worth your consideration.

For video, the TX-NR717 has eight 3D-compatible HDMI inputs with up to 4K upscaling (provided you have a 4K display) using Marvell QDEO processing. Also included is a PC monitor input, iPod/iPhone connectivity, and access to Internet Radio and internet music services (Aupeo!, Pandora, Rhapsody, Spotify, and vTuner). To make getting started easier, the TX-NR717 also incorporates the Audyssey 2EQ automatic speaker setup system.
Compare Prices for the TX-NR717

Also available, the TX-NR818, which adds independent block construction for the preamp and amplifier sections, ISFccc video calibration controls, DTS Neo:X audio processing, 9.2 channel expansion using external amplifiers, Audyssey MultEQ XT32 room correction system, and an activity-based remote control system.
Compare Prices for the TX-NR817

For more information, read my more detailed overview of both receivers

Also available: The Harman Kardon AVR3600, which adds more power output (80wpc x 7), 7.1 channel preamp outputs, and a backlit remote control. compare prices for the AVR3600.

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On the rest of the audio side, the TX-SR515 provides Dolby TrueHD/DTS-Master Audio decoding, as well as Dolby Prologic IIz processing and Audio Return Channel.

On the video side the TX-NR515 is 3D compatible and also incorporates Marvell QDEO 1080p and 4K video processing and scaling. There are also eight HDMI inputs with InstaPrevue switching and the front panel HDMI input is also MHL-compatble, allowing for direct access to 1080p video and up to 7.1 channel surround sound from compatible portable devices, such as selected Smartphones and tablets. For added convenience there also two HDMI outputs.

The TX-NR515 also has a front panel USB port for accessing audio content from iPod/iPhone or USB flash drives, as well as DLNA network connectivity, and Internet Radio access (Spotify, Pandora, and more). The TX-NR515 also compatible with the Onkyo UWF-1 Wireless USB Adapter, which supports wireless internet access.

To make speaker setup easier, the TX-NR515 also incorporates Audyssey 2EQ speaker setup system, along with Audyssey's Dynamic Volume, and Dynamic EQ audio enhancements.
Compare Prices for the Onkyo TX-NR515.

Also Available - The TX-NR616: Added features include THX Select2 Plus Certification and Audyssey DSX surround expansion.
Compare Prices for the Onkyo TX-NR616.

On the video side, the RX-V673 has six 3D-compatible HDMI inputs with analog to HDMI video conversion and both 1080p and 4K upscaling. The HDMI output is Audio Return Channel-enabled. Extra bonuses include iPod connectivity (via optional adapters) and direct iPod/iPhone connection via front mounted USB port, as well as network (DLNA) connectivity that allows access to internet radio and digital media streaming from a PC or media server. In addition, the RX-V673 is Apple AirPlay compatible.
Compare Prices for Yamaha RX-V673

Also available: The step-up Yamaha RX-V773WA. This model adds a USB WiFi adapter (the the "WA" designation included in the model number), making connection to a home network and internet more convenient. Also added is a more refined version of Yamaha's YPAO automatic speaker setup system, dual HDMI outputs that allow connection to two video displays at the same time, and a set of 7 channel analog pre-amp outputs that allows connection to more powerful external amps for up to seven channels, if desired (this would bypass the RX-V773WA's internal amplifiers for the channels involved).
Compare Prices for Yamaha RX-V773WA

Also read my more detailed overview of both receivers.