It's difficult to say weather you would hear a huge difference but I believe there would be a noticeable difference. When I was auditioning separates I came to the conclusion that the AVM 30 / D1 were the most amazing processors that I heard at that price point. I found the AVM to be better than B&K, Rotel, Outlaw, Krell, Adcom, Halo, Sunfire, and shamefully close to Theta and Meridian. I know it's a bold statement to compare AVM with Theta and Meridian but those were my findings. It would be hard to beat the 3805 w/ separate amp with mid-fi separates but I think that the AVM would do it for you. I'm a huge Denon fan but the only upgrade that I would ever make into separates would be the AVM. Truly, an amazing processor.
Good luck.
Good luck.