He's right under our noses...
John Lies, on the in-house DMR feed. Listen to him (if you can) doing the paddock report on every entrant.
Dude is prepared, presents the info well, can be critical without being condescending, and has a voice that sounds professional. His brief description of each runner is concise, yet informative. Very polished individual.
I predict he'll be Trevor's heir apparent, if he already isn't. Basically he's a younger Yankee version of Trevor anyway, if you've ever heard him call the races at Lone Star.