Martella.
Lerman, who's been up for the role since pre-TASM days.
Highmore, who's become something of a breakout star and his name has been floated around with a bunch of others for potential PP/Spidey, so there's a chance he could get it.
Out of Highmore and Lerman, I'd like to see Highmore get it for the simple reason that a lot of his roles gave me Peter Parker vibes, even when he's playing Norman Bates at times.
Combine that with his acting ability, innocent demeanor, baby face and humor he's shown in Astro-Boy and Bates Motel, I think he'd strike the perfect balance between Peter and Spidey.
However, I'd be just as happy if Lerman got it.