Now that you know how to efficiently shoot at these vehicles, the next step is to know whats in them. Seer councils, and firedragons might be your obvious first transport priorities. To break the wave serpent spam lists choose the right weapon for the right job. Then you can fall back on weapons that are less efficient.
While their weaponry can sport bright lances, pulse lasers, eldar missile launchers, I tend to ask what is on what. Remember that bright lances reduce all armor values above 12 to 12. Otherwise, I'm generally more concerned about whats in them, and what I have that can bring down that vehicle, rather than what they are equipped with. (that's the easy part of target prioritizing).
Last thing to remember. Eldar players tend to do a lot of tank shocking and ramming with these vehicles, as they are considered to be tanks. So expect tank shocking/ramming fast skimmers.