I'm about to get some used gear, an amplifier in this case. I'm currently considering an Aragon 4004 MK2, an Adcom 5500 and an Anthem MCA-2. I'm gonna be using them with a pair of power-hungry 6-ohms Dynaudio pair of Speakers, the LR120+. I was wondering which of these would you buy, price is similar, so not an issue. I could consider also the Adcom 555 Mk2, but it seems too old. Anyway, if you have got any suggestion in that price range I'll also greatly consider.