The Onkyo TX-NR818 is a standout receiver in the under $1000 (street price) range. I have nothing but good things to say about Denon. But in this particular case, Onkyo really brought a feature set that cannot be beat at this price point right now.
Audyssey MultEQ XT32, THX Select2 Plus, superb video processing and upscaling from HQV and Marvell. It's a features champ.
Of course, if you'd like two independent HDMI outputs (the two HDMI outs on the 818 are just mirrored), THX Ultra2 Plus, independent dual subwoofer auto setup and EQ, and VLSC, you can step up to the TX-NR1010, which seems like a bit of an odd duck in the Onkyo lineup at first glance, but has a few, nice extra features over the 818 for its higher price tag.
But for under $1000? I've gotta vote Onkyo 818
