i hope you meant the opposite of everything you just said. Elans are fucking tanks that are certainly NOT light. they kill it and are hood as fuck.
Anyway, lightest pair I have used would be the Liberty LTE. Most durable ski I have seen too. the edges do not crack because they are made specially for park. Punx aren't anything special as far as swingweight, APO's are actually pretty sick, but don't feel very light, Armada's are nothing special in any category,Moment's are decently light but i would still say the LTE is your best bet. If you want a wide, light ski then definitely look at the Icelantic lineup
Seriously though, my friend rides decently hard, but he rides year round and competes on Waterville Valley's freestyle team and he has used LTE's forever. his first pair which are like 3-4 years old are still in great fucking shape and going strong. and he has another, bigger pair taht is 2 years old that he used this year to compete with even though they are too small. He has owned this years Thall's, but they broke, he has this year's punx right now, but they are breaking, and he said he is going to get another pair of LTE's because they are so bomber and amazing for this year once the Punx break.
OP, what does that tell you?