Thats quite a decent setup :)
The sennheisers I think will be a lot like your Denon's.. bass heavy with a veil... if the Grado 325's are too bright/harsh for you, then sell them and step down to the SR-225's.. those are the sweet mid point in that price range.. the smaller brother of the RS-1
It also depends on your music.. grado's are a godsend for classic rock, metal, any guitar driven genre..the Denon's will cover you for any bass driven music
Edit: Forgot to mention.. if you're on Head-Fi like it seems you are, you should REALLY look into doing the markl mod for your Denon's
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