If you want to save money (while not losing much in terms of quality) then M3 would be a good idea. It is supposed to have really good and tight bass along with very slightly warm mids which will help the denon. Just make sure you get the sigma11 power supply along with it for best performance. All of that should be around 500$, I guess. There is one disadvantage in this setup IMHO. Since Denons are supposed to be inherently smooth, this setup can get very sugary.
Other options include
a Rudistor NX-03 and a used Phoenix (Skylab mentioned that d5000 would be a good match for phoenix in his review)
Quote:
Originally Posted by Skylab /img/forum/go_quote.gif
I wish I still had my Denon D5000’s – I bet they would sound great with the Phoenix if my memory of them serves me.
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Apparently the beta22 is supposed to be so good that the Denons shake like subwoofers with them. Godlike deep bass, in other words.
Also check out this post -
http://www.head-fi.org/forums/6009914-post236.html
I guess that covers a lot of options.
Edit: Just checked that you had a better Rudistor for sale. I guess you know the signature and have already ruled it out then.
Edit 2: Check out this link for a comparison between HR-2 and Raptor, both from RSA -
6moons audio reviews: Ray Samuels Audio Raptor
Edit 3 (I know this is too much ):
http://www.head-fi.org/forums/2565039-post5.html
This link is a comparison between GS1 and Raptor. Now HR-2 was warmer and punchier than raptor and GS1 is thinner than Raptor. Therefore HR-2 is warmer than GS1. M3 is also gonna be warmer than GS-1. Phoenix is gonna be slightly warmer but very transparent and nearly neutral, although very smooth and romantic in comparison. Beta22 is going to be transparent and smooth but closer to GS1 in terms of sound. I hope I am making sense.
Just to be clear, I don't own any of these amps and this information has been collected from the referred sources.