Whoever mentioned that you want to get something all stainless steel is spot on. Some of these clones are just chrome plated brass, which you don't want to expose to high heat and then inhale from, unless it's naval brass, which is an entirely different discussion
If it were me, I'd get this :
Kayfun Lite Clone by Tobeco with Airflow Control - Eciggity It's from an American seller, so you won't have to wait a month for it. They are fairly reputable, so if you do get a dud, they will more likely than not make it right. It's entirely up to you though, but if were me the extra $15 is worth the piece of mind.
On an unrelated note, I write juice reviews and post them here and on reddit. I just posted a new one today and I am stealing a page from Jah's book and having a contest, the winner get's 5x10ml bottles. Unfortunately it's not AIV, but if you guys and gals are interested I'll post or PM the link. The contest is easy, you just have to guess the scores of this weekends football games. Don't worry if you don't follow football, you have as much chance as an avid fan.