The Melody is probably nice, but at $3K, not what I would call a budget amp. IMO you can put a lot of money into amps behind the Druids or not so much, and each way you get terrific sound. What the higher ranges buys you is the audiophile stuff like depth, refinement, etc. But the Druid is such a foot-stompin' pleasure machine that it is not *necessary* to drop that much cash, just nice if you got it.
From my own experience, YMMV, I would advise anyone who has just purchased these speakers to start small (ie cheap) with amps and carefully observe what the steps can do for you. You may reach a point where you find it's as good as you want it (this is excluding the obsessed audiophile, and I know none of them live here) and you only laid out a few Franklins.