Just thought I'd update after getting my D2k's back from a friend..
OP, you are totally right, in the part where hiss is virtually non-existent on the Denons. ~-25 is where I begin to notice the noise floor. However, I notice the receiver really sucks out the mids. This hadnt occurred to me until I tried my V-80's on the HK(awful pairing). Funny enough, the HD650 and T1's sounded great from the receiver. Isnt the receiver supposed to have a flat EQ with bass and treble dial are centered?