Well I don't know if Cartoon Network still has the rights, but Totally Spies and the Amasing Spies would be an welcome addition. And also Code Lyoko as I hear there is a new Code Lyoko series coming up.
But on the subject, it would a major quo for anyone that includes the HUB, if they could aquire the rights to the Digimon anime. Rerun the old series, but at the very least air the new Digimon Xros Wars series.
Also if this show ever got relicensed and redubbed, Sailor Moon. Though I think the HUB would censor the hell out of it.