Amplifier upgrade advice under $2000


Hi!  I have a new pair of speakers on order and want to upgrade my power amplifier to be ready when they arrive.  My current system is Klipsch Heresy III, Onkyo M504 amp, MiniDSP SHD preamp/streamer/room correction, and SVS SB12 sub.

Scheduled to arrive in December are Ohm Walsh 2000.  Research indicates these like a lot of power.  If the Ohms don’t work out I’ll shop for a used B&W 804, so still probably needs good power.

So, with a budget under $2000, wondering if I can get something that sounds significantly better than the Onkyo.  Used is fine.  Brands I have seen come up in the price range are Classe (ca-150), Vincent (331MK), Krell, PS Audio, Parasound, Bryston, etc.

I want to know if this would be a significant upgrade in this price range.  My sense is that brands like Rotel, Adcom, Emotiva, etc. would probably not change the sound all that much.  I also have a Crown ps-400, for example, that sounds pretty much identical to the Onkyo.

I recently tried out a Rogue Atlas Magnum tube amp.  It sounded great with the Heresys, a definite upgrade. Unfortunately  it created a loud speaker hum that I was unable to fix.  But it did make me crave the tube sound.  But it seems like finding a high powered tube amp to work with the Ohm Walsh is going to be challenging.

Sorry for the rambling, basically, is it worth spending $1-2K on a new amp or should I wait until I can get into a higher price range before ditching the Onkyo (which has those awesome green meters!).  Thanks!
judsondickie
I suggest you do research on the C-J MF-2200, MF-2300 and newer models to see if any of these fit your needs. They're very good performers and they last. Reviews are available online. I only had good experience with my MF-2100, driven by a PF-R or a PV-10AL, depending on the mood. (Caveat: You may need to replace the few electrolytics there are.) 
Save up and buy a NAD M33.  Amazing sound, Dirac live included, BluOS faultless streaming, much more.  I absolutely love mine, all the great reviews are true.
I’m surprised that The Rogue Audio Sphinx v.3. has not been recommended.  It’s a 100 watt into 8 ohms  and 200:watts into 4 ohms integrated.  It’s satisfactorily driving my Maggie MG12s and the Ohms are easier to drive.  The bonus is that you can roll the 12AU7 preamp tunes to tailor the sound even more.  My recently upgraded Walsh 2.2000 provide a relaxed, musical presentation with surprising base driven by a Musical Fidelity A308.  A new Musical Fidelity m5si can be had for just under 2K and is a high value 150 watt high current integrated that will drive most anything you will throw at it.  



OP, I have a Parasound A23 driving a pair of Klipsch Forte II in my second system and it is a great match with more than enough power to really make them sing.
I'm seeing A23's used for about $700 125w 8ohms 225w 4ohms.
Then there is the A21 I see for $1700 - $2000 it 250w 8ohms, 400w 4ohms

Im not sure about how hard it is to drive a pair of Ohm's but I do know how hard it is to drive Magnepans properly and Hegel does an outstanding job. FWIW.

John
I think you should get familiar with your speakers 1st. Then shop for a suitable amplifier. Maybe you will find that you don't need one now, and can continue to save to make a more substantial upgrade when you choose to do so.