Wanna buy my 3808CI too? (just kidding!)
I can't comment on the Emotiva, nor the other brands cited, but just got the 3808CI (replacing an old Yamaha RX-V1000), and am quite impressed. I didn't intend to use it for pure two channel listening, but it's surprisingly capable, rivaling (some even say surpassing) my Modwright (tube) preamp. I bought the Denon specifically because it has the Audyssey MultEQ XT.
IMHO, the Audyssey did a great job taming my problematic room bass nodes, and balancing overall sound, particularly for home theater. I am feeding the front pre outs to my Belles amp to drive my Summits, but the Denon is driving my center and rear surrounds without difficulty. I think it would work exceedingly well with the Sunfire. You can always add a two-channel pre-amp with Home Theater bypass at a later time.
The 3808CI has WIRED ethernet connectivity to d/l firmware updates (a BIG plus), as well as accessing Internet Radio (but I prefer to use my Squeezebox for that). Stepping up to the 4308CI adds WIRELESS ethernet and built-in HD radio, but, IMHO, not worth the extra $$. I think the 3808 hits the "sweet spot" with price and features. My only complaint is the user-UNfriendly PRIMARY remote, but the SECONDARY remote works fine for everyday use. I've had no problems with HDMI handshaking with my Sony XBR4, or Oppo 980H, but other folks have had some issues (most seem to be user related).
There's a HUGE thread discussing it's virtues (and user issues) here...
http://www.avsforum.com/avs-vb/showthread.php?t=860539
There is also a long Audyssey thread on avsforum.com, discussing the nuances of that feature.
BTW, 6Ave.com was offering a great deal on the 3808 a couple months ago, but I don't know if they still are (see msg...
http://www.martinloganowners.com/~tdacquis/forum/showpost.php?p=60697&postcount=10)