Another unknown is what the EIRP level will be on the replacement satellite Galaxy 19, which is scheduled to be put into the 97 West position in a few short months, allowing Galaxy 25 to move to other duties (probably 93 West).
A 1.2 meter is a good conservative antenna for the present time, and I doubt that even if a significant improvement is made in signal levels, that anything smaller than 90 cm should even be considered. And as a previous poster said---elevation angles are quite low in south-central Alaska, in the single digits---meaning that many locations will have problems clearing terrain to the southeast. Only the western and northern areas of the main part of Anchorage will have a clear shot over the Chugach Mountains, and then in most cases it will take a rooftop installation. Any cheaply made antenna will not last a season in this community, due to multiple yearly events of Chinook winds that are often of hurricane intensity. If you need to deal with 1.2 meter antennas, it would be best to make a package deal from a company such as Satellite Alaska in Anchorage, who would be happy to sell wholesale to a company such as Sadoun---they bring in antennas by the container-load into Anchorage. Check the freight costs of bringing in five units even by the cheapest air freight company, and you will find that it is not economical.