I am just wondering what I should buy for VP on my lock.

http://eu.battle.net/wow/en/characte...d/Wyril/simple

As you see I have 2 ToT lfr trinkets, pretty good for destro, and I am wondering if it's worth to buy the Shado-Pan Assault trinket, I am a bit unsure since it procs haste. I want to go demo when I have better gear, is it good for demo?