Why not a Cityship built specifically for war. Smaller than Atlantis but twice the firepower. The ancients designed it as a mobile space station that could stay inside hostile territory to serve as a supply base and repair center for Aurora warships deep inside Wraith territory.
Think Atlantis but instead of outer piers having towers they have Arcturus Zero point guns. Tens of thousands of drones that are fired from each of the piers.
12 Aurora's can be serviced simultaneously to repair and resupply. They have multilayered shields.
It is powered by 4 zpms but it has Solar generators that recharge its ZPMs in case they couldn't get replacements from Atlantis.