I use a Crayon CFA 1.2 integrated amp with my Athena v.2. The Crayon puts out about 75 watts into the steady 6 ohm load of the Athenas. It is a solid state amp from Austria. See 6moons for a good review. It is the best pairing I've heard with my Athenas. Extremely good bang for the buck at $6k. Crayon just came out with a less powerful integrated that promises even better bang for the buck at about $3200.
Initially, I drove the Athenas with a 10-watt Shindo Cortese single-ended tube amp and a Shindo Monbrison preamp. This pairing produced some luscious, dense, immediate tone and was very musical. Together, these amps retail over $20k but did not prove as accurate, transparent, or ultimately satisfying as the Crayon. Still, there was absolutely no problem that I had with dynamics, headroom, or ability to play loud music loud.
I've also driven the speakers with a 15-watt Bakoon integrated solid state amp that was similar to the Crayon and is another good value.
I've heard the Ulysses with a 200 watt Modwright amp; this was another good pairing. And I've listened to jonbee's DA-RMAs with his very powerful N-Core amps and completely agree with him that the sound is transparent, fast, and conveys a sense of total ease, especially with complex music. Fantastic value.
Bottom line: it is a testament to Lou's acumen as a designer that his speakers sound so damn good with so many disparate amps!