I would think Emotiva or Outlaw would be the places to look for a pre/pro cheaper than or equal to the full featured receivers, but you may have to wait a little as I do not think either one has a pre/pro that decodes all the newer codecs. The Yamaha 663 has outstanding value so far as just being a pre/pro.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70