I think there are plenty of energetic and charismatic Catholic apologists, but I find myself considering Catholic networks when I consider media heirs of Archbishop Sheen.
Of course, Mother Angelica's Eternal Word Television Network is a fixture in providing radio & television programming, and has quite a presence on the Internet. It started with Mother Angelica but now has scores of personalities with a variety of Catholic programming.
The Canadian network Salt & Light TV produces some excellent programming, some of which airs in the US on EWTN.
One priest who harnesses New Media to spread the Gospel in a dramatic way is Father Robert Barron and his WordOnFire.org apostolate. Just a few highlights: Fr. Barron is a fantastic teacher; has an excellent podcast, and his "Catholicism Project" is a "landmark, epic documentary series" to reveal the beauty & truth of the Catholic faith.
Whom do you consider to be the spiritual/media heirs of Archbishop Sheen today, in terms of using their gifts and zeal to spread the Gospel in unique ways?