Your C/A amp/CDP should be fine, C/A is quite laid back. Id say that Marantz, Cyrus etc wouldnt be well suited to the AE109's as their treble is slightly edgy/forward.
The AE109's will trounce the floor with the Gales. You'll notice a massive improvement but make sure thaat the AE109's arent too close to rear/side walls as they have a rear firing port as well as the 2 small front firing ports.
Arcam and Rotel would be well suited to the AE109's, might be worth looking at them if you can.