The SB Thorns build already procs poison, because thorns dmg is converted to poison dmg.
The most recommended is quill volley, crushing hands, or rake. The key thing is that it doesn't really matter which core skill you choose--as long as it's close range, that's all that is required to make your unique pants proc.
Summoner necro is also good this season. They can do T4 content easily. As long as you aren't interested in pushing pit 100+, summoner necros are VERY strong, can do all T4 content, can kill T4 Uber bosses easily, and so on.
They lack mobility, so you want to make sure you've got a Jah rune in there to teleport around.
If you enjoy playing a summoner/minion necro, this is the perfect time to do so. The new unique gloves for mage summons are supposedly really strong, but I just didn't like that you have to be the meat shield rather than your summons.
GL to you!
I too have heard of the Quill Volley being strong. I just don't know HOW strong early game prior to uniques being acquired.