Need recommendation for amplifier

I'm looking to improve my amp and  basically I'm in the same path as you,  but I need more time and money to pull the trigger.  So just a recommendation,  read about the Nuforce sta 200,  even I'm on your budget also this amp for 500 usd might be my  bet. If you can compare it with the red dragon please report your impressions. 
Regards 

IMO the NuForce sta 200 for $500 is amazing. It was very close to my  NuForce monoblocks, which I loved, that were four times the price.  Of course my preamp and downstream components had something to do with the final result.
As far as the Red Dragons are concerned, I just got them and can’t make an informed judgement. They’re very promising but not ready for prime time yet.
I would have no absolutely no hesitation in recommending the sta 200 though.
If you’re on a tight budget I’d definitely try it.  On Amazon you have months to return it, and If you’re on Amazon Prime, it costs nothing to return it.

First impressions of the Red Dragon:

At this point, very bright and revealing; Excellent definition and soundstaging,
Good bass control.
I just hope it calms down to a more subdued presentation.
So far, not as pleasing as my former amps.
Whether it’s just too revealing or it’s not broken in yet, I don’t know.
I have 45 days to decide what to do.

One more thing about the Red Dragons,

Records display none of the problems of CDs.
They sound very natural!
Maybe a different cable between DAC and preamp would do the trick.
But we’ll wait and see.

I meant cable between transport and DAC.