keegiam, I think it's more important how the amp does with 4 ohm or below loads than how many watts. I've tried my McCormack dna .5 and Rogue Atlas Magnum 3 tube amp (each 100 watts) with good results. But, my Hegel H360 is the best combination. 420 watts into 4 ohms and damping factor of over 4000 does the trick very nicely.
As mentioned, they are not the best for slam or rock concert levels. But get plenty loud for me. They excel with drums, voices, guitar, horns, air. I will most likely be picking up a REL sub in the near future to help flesh things out.