Detecting Collisions with specific objects?

How would I go about detecting which of 3 different objects a wandering prim of mine collides with?

do I use the llDetectedName(0) call to check for a specific object's name? Since I'm intending to use this in 5 similar prims that are competing to touch the objects, how would I deal with the scenario that it collides with the target object and another competing prim at the same time? My experience with checking for multiple things in a loop has shown to delay the script's time, sometimes a significant amount which.

One easy way of doing this is using three scripts, each with a collision filter set to accept collisions with one of the three target objects. The only way to do it reliably with only one script would be to use a loop - something you dont want to do.

Example:

default {
    state_entry() {
        // Only accept collisions with objects named "Foo"
        llCollisionFilter("Foo", NULL_KEY, TRUE);
    }
    collision_start(integer totalNum) {
        llOwnerSay("Collided with " + llDetectedName(0));
    }
}

See:
llCollisionFilter
Collisions