Hi srk16,
Because you mentioned "low volume", I will recommend that you limit your choice between the Denon AVR-1909 and the Onkyo TX-SR607, which have both Audyssey Dynamic EQ and Dynamic Volume.
They are both very excellent, with the Denon having a better Audyssey room EQ.
With your Wharfedale Vardus 5.1 speakers, you might want a clearer sound, which the Onkyo will provide. But if you like a smoother and more reserved sound, the Denon would be the one.
You seem to be more oriented into Movies. I'll go with the Onkyo TX-SR607 to taste the full impact with great clarity from the new high resolution audio codecs; Dolby TrueHD and DTS-HD MA.
Also consider their street prices. You might save more money with the Onkyo too.
Me, I like a sound that is very present, firm, full, clear, no shyness; so I choose the Onkyo. And your speakers will match it good too.
Cheers,
Bob