probably the best "features vs. cost" receiver out there is the Onkyo TX-SR606 a/v receiver.
factory refurb from authorized reseller (factory warranty applies)
http://www.accessories4less.com/mak...-1080p-Cable-3-Year-Extended-warranty-/1.html
new unit, standard warranty
http://www.accessories4less.com/mak...-1080p-Cable-3-Year-Extended-warranty-/1.html
Good receivers that can decode regular Dolby digital 5.1 surround sound are available and less expensive, but you mentioned you want to decode the lossless HD codecs on Blu-ray disks, so the Onkyo unit is about the least expensive quality unit out there