Doge v2/v4 is probably one of my favourites with cloud production. As far as flavour goes, I'd get something else, but it definitely has cloud production in mind. Unfortunately, it can have too much airflow, depending on your build and wicking.
My doge heats up quite a bit, but I've become used to it. I retired it recently, due to searching for more flavour, but it's a solid atty. Giant post holes, and a decently sized juice well. I would say that the only drawbacks are the cap height, and the proximity of the posts to the sides of the cap. Since the chuff also acts as airflow adjustment, the inner diameter of the top cap is going to be your build space; and that cuts down a bit on the coil builds you can do.
I love my Doge, but it does have a fair amount of drawbacks. My Dark Horse beats it... even if my cheap clone's insulator melted when crimping a parallel build. Still, I'd recommend a Dark Horse to the Doge any day; unless you're just going for clouds, and don't mind the limiting deck space of the Doge. Also, just from the looks of the Airek, I'd say you will likely run into similar build limitations of the Doge... so you probably don't mind it. Another RDA I'd toss out there is the Tugboat v2, with either a comp cap or the steam stack.
As far as clones are concerned? The Doge is cheap enough to avoid going the clone route. Even on Local Vape, the Doge is only $55. That's about as cheap as an authentic will get; and most clones will run between $20-35, unless you go direct. Not to mention, from the clones of the Doge that I've seen, and worked on, they're a bit too cheaply made for my taste. Just buy an authentic; they're cheap enough to afford on smaller budgets, and you'll get a better quality atty... for under $60. If you want a Doge, buying a clone is only for someone who really can't afford the already low price of the authentic ones.