NAD T 747 vs. Onkyo TX-NR709
Just about every A/V receiver these days has at least 5 channels of amplification and can decode all the lossless audio formats. The 7.1-channel NAD T 747 (reviewed here) has everything you want except low-volume dialog compensation. NAD has a reputation for skipping some features in favor of audiophile performance at reasonable prices, and the T 747 seems to follow this trend; as reviewer Mark Fleischmann concluded, "it delivers impeccable amplification that can tell a cinematic story and weave a musical spell." On the other hand, the T 747 is getting a bit long in the tooth; our review of the T 757 will be posted in the next few weeks.
HT hasn't reviewed the Onkyo TX-NR709, but we have reviewed the TX-NR609, which is one of our favorite budget AVRs. However, it doesn't have pre-outs, so let's take a look at the 709, which has everything you want, including Audyssey and THX low-volume modes and pre-outs. It also has HDMI 1.4 connections (the T 747 uses HDMI 1.3, so no 3D or other features of 1.4), and it uses the Marvell Qdeo video processor, which is certainly newer and probably better than the NAD's Faroudja DCDi processor. You don't mention access to Internet radio and content on networked devices, which the Onkyo offers but the NAD doesn't.
Other AVRs to consider in your price range include the Integra DTR-50.2 ($1400) and Marantz SR7005 ($1600), both of which offer all the features you want as well as access to online and networked content and more power than the 709 or T 747. Please see the reviews of these units for the specifics, but I'm confident you won't be disappointed in any of them.
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