As you may already know Sony are splitting the Starhawk experience into three packages as it goes digital on September 26. There is the complete version (€34.99/£28.49), then there is the multiplayer only version (€19.99/£15.99), and finally PS Plus members will have free access to the solo campaign.
As you can see in the trailer Lightbox Interactive also have lots of DLC planned (some will come free with patch 1.4). So now is a good time to jump in with Starhawk. Especially if you're looking for some multiplayer action on PS3.