Both would be a great fit for a power forward spot. They could score a ton of points with James, Hughes, Walker/Abdur-Rahim, Z and a pass first/3 point threat point guard.
That'd be a nice team there. I kind of like the idea of Antoine Walker. He doesn't have to lead or anything, he can be a vetern voice in the locker room. He's been to the Eastern Conference Finals before and he has loads of talent. AND he's gotten better at taking less threes (though not nearly enough).
Shareef Abdur-Rahim is a good player too, though he's never been to the playoffs before, so who knows how he'll handle it. Not to say he'd be freaked out or anything, but it'd be nice to have a starter with at least some extensive postseason experience.