What amplifiers should I consider ?

I am purchasing a set of Hales Revelation 3 speakers, and believe my Acurus DIA 100 MK II Integrated Amplifier is going to be somewhat "challenged." I intend to purchase a more powerful amplifier by Christmas, but am limited to a budget of perhaps $1500 US. Obviously, I will be looking used, but I am looking for opinions on what amplifiers to consider. Current thoughts include the PS Audio HCA-2, the Aragon 8008, and the Marsh A400S, but I am open to suggestion. Perhaps some Hales owners can give me feedback on what they are using and if they are happy with their current systems?