I too practically bled my eyes from all the reading I did here to research 3 AV recievers (the Onkyo TX-SR876, Denon AVR-2809ci, and Marantz SR6003).
From all the posts I've read here, and in various reviews, here is what I have concluded:
-- the video processor is the newest and best of the three and has a plethora of adjustment capabilities
-- 140watts x 7 is tremendous, though some reviewers say this number is a bit overstated (it will still rock your house like never before)
-- unit is BIG and HEAVY (50lbs), and makes a LOT of heat, most likely due to the video conversion circuitry as well as the amp. If you don't have a lot of open airspace ABOVE the 7-5/8" tall unit, it may not be a wise choice.
-- the sound isn't as detailed or "spatial" as the Denon or Marantz, but is still rated as very very good, better than most.
-- extremely flexible in configuration possibilities
-- beefy amp produces a bench tested 100 watts with all 7 channels driven
-- nearly all reviews I've read of it claim an exceptionally detailed sound
-- Denon quality is arguably second to none
-- runs relatively cool
-- on screen display/menu is ridiculously cheap looking (like old Atari games)
-- best sound of the three (even though it's made in China), incredibly detailed and produces a deep three dimensional soundstage
-- most agree the exterior design is beautiful and extremely solid
-- though rated at only 100w x 7, easily pushes sound past the 100db level, where pain in the ears can occur.
-- video up conversion is very good with the least amount of reported problems by users
-- runs rool even after running it hard
-- bass notes seem more pronounced and hard hitting of the three
-- built in circuitry to "crisp up" MP3 compressed music files (best improvement with 128bit files versus higher rates)
So it seems that each has it's advantages over the others and it will depend on what you are looking for in a reciever.
Myself? I am leaning strongly towards the 6003 as well, though I could easily pick the Denon too!