Eric I haven't used these particular Dynaudio's but I have owned two different models in the past. They do need a good quality power source to really shine.
The watts doesn't determine the amps ability to drive speakers actually. It's the amps ability to provide the speakers a good current source. That doesn't mean a good quality amp can't have high wattage and high current. Actually some of the good ones provide both.
You may want to move into something outside the Marantz line. Their old tube gear was great and some of their old receivers have a good following but I think you could do better. Check the forums for amps to match the Dynaudio's and look at your budget. Good luck
The watts doesn't determine the amps ability to drive speakers actually. It's the amps ability to provide the speakers a good current source. That doesn't mean a good quality amp can't have high wattage and high current. Actually some of the good ones provide both.
You may want to move into something outside the Marantz line. Their old tube gear was great and some of their old receivers have a good following but I think you could do better. Check the forums for amps to match the Dynaudio's and look at your budget. Good luck