Those are great Buckster! I seem to have the "crowns" and what not taken care of with my current rigging. Im specifically wanting the more advanced collisions.
I think the big problem you'll need to overcome is the precise timing of the drips themselves. Unless they are exactly timed apart from one another, you'll simply NEVER get a collision, except by pure accident. One has to follow the first at an exact timing in order to collide with the first one just as the first one is splashing up.
That's where the more expensive triggers come into play because they trigger not just the lights, but the precise pumps/drippers that squirt out more than one drip in a precise timing between them, then fire the light at the precise moment they collide. In addition, those pumps and the controllers also control how much liquid will be used for each drop, which can make a big difference as well. So, one drop can be bigger than the other, providing unique varied results.