OK so I found a very decently priced amplifier that works well with my setup. It's called the Sense G5 hybrid amplifier. It really helps to roll off the treble that most complain about. I got it for ~$150 from this seller:
Why does that amp look so familiar?
Another solid amp that rolls off the top end a bit would be the Emotiva a-100. Yes, it's a speaker amp, but think of it this way: it only outputs 2W more than the venerable Lyr everyone pairs these with, and arguably sounds completely comparable at half the price. Runs pretty cool as well.