How about a Serpent for those DA's and another set of Guardians and a couple of weapon platforms. Swooping Hawks would also work well in this list.
The extra Serpent will not only make your DA's more powerful, but it will also help reduce the amount of enemy firepower directed at your Falcons and your other Elite units. The extra bit of Guardian Defenders is just for redundancy. The Defenders are not superb units, but when massed they can be pretty mean. I mentioned the Weapons Platforms because I didn't see them in your list. I recommend Scatter Lasers.
If an Elite unit is what you guys have in mind, then yeah, the Hawks should do well, and give the Autarch a unit to play with.
The extra Serpent will not only make your DA's more powerful, but it will also help reduce the amount of enemy firepower directed at your Falcons and your other Elite units. The extra bit of Guardian Defenders is just for redundancy. The Defenders are not superb units, but when massed they can be pretty mean. I mentioned the Weapons Platforms because I didn't see them in your list. I recommend Scatter Lasers.
If an Elite unit is what you guys have in mind, then yeah, the Hawks should do well, and give the Autarch a unit to play with.
