Do it both ways and see which way you like.
Personally I'd stick with the POV character -- you can still develop the "other characters" through the POV character... I think the result could be more gripping than suddenly switching heads. The reason for a close 3rd limited is that the readers can identify with a character and go along with him. If you change, mid-scene, to a different character's head, even though you're trying to show what that character is thinking and hopefully make the story more gripping, the result could be opposite -- suddenly your readers are yanked out a stream of consciousness and they might say, why should I care about this other character? Especially if the character will not be there later on in the story, the effect could be even more jarring. Also, the head hopping (within a scene) do takes the readers off the page a little, because the readers have to switch gear as well -- now they're supposed to care about another character, instead of someone they've just followed...
That's just my preference.