Thank you for the help guys, I decided to go for the Elementalist and loving it so far. One question though what item level would I need on my items to take the elementalist into a perilous run?
I would say any unique around lv20 would be enough if you want to run FC on Perilous. But if it's any other maps you can probably get away with something lower (if you want to go in with a lv16 ish character).
As for an elementalist, if you are going for a crowd control build (i.e. Firestorm/firewall being your core skill) then you can pretty much get away with any staff so long as you can keep firestorm up and stay alive. You do plenty of contribution that way already even if your damage is low (likely chance is, you get some dps monsters in your lobby anyway).
In reality though, if you can just pick up pots, open doors and etc, and don't die too often, people probably don't care if it's just Perilous. Oh, and for the love of god don't keep pressing "over here" for the whole match if people decide to just skip a door or something. That's all you need to triumph in Perilous, honestly.