Only my opinion, but if it is just going to be a daily driver, rebuild it without spending extra on beefy rods and pistons. Delta cams would be nice and cheap. I am not sure if the OEM valvetrain will be sufficient. Then tune it for the best gas you have in your area. The tune will make the biggest difference, performance will be worse if you don't.
08 Legacy 2.5i SC
98 Impreza OBS