If you get a variable wattage device and are leaning to sub0hm (and yes, the Crown is a good choice) I would recommend getting a moderately priced two battery device that gets good reviews for reliability. The ability to use TC (temperature control) might be nice down the line, but you don't need an ultra expensive DNA device to start out with. You also want the right batteries for the resistance you land on, which at the moment seems to be a preference for sub0hm, although it's hard to say for sure.
Good brands (IMO) include teslacigs, eleaf (the Eleaf Invoke is a decent, moderately priced mod) Vapresso, Voopoo (mixed reviews a bit on this company) and there are a few others.
Getting a dual, external battery mod will not limit your choices moving forward, as you can wind up with whatever topper (MTL or DL) that you wind up preferring. To me, it's probably the best way to move forward given your preferences aren't dialed in yet. Could check the VV/VW board and maybe the review board for suggestions.
For me, the road to my "perfect vape" was littered with the wrong type of equipment, or bad equipment, or just plain not suiting my needs. It is, unfortunately, sometimes part of the process. The good news was, I don't regret ANY purchase I made that got me vaping successfully, and learning more kept my thoughts away from smoking.
You are doing fantastic at a month in, and some cravings are normal. But, that's how I got to understand my preferences, and I'm not regretful of what I didn't use. It all helped me (or somone else) on the road to vaping. So, start out costs for vaping can sometimes seem high, but everyone has to start SOMEWHERE. The good news is, once you figure out your preferences, vaping will pay for itself, even if you had to "overpurchase" in the beginning and also, most vapers want at least one backup vape, if not more, even if not your ".preferred" vaping style (especially given the fact that the FDA has not (IMO) honestly stated what will happen to vaping yet.
I just don't want you to get paralyzed at your options.... Even if the next vape isn't the "perfect" device in every way, it will move you closer to "vape nirvana" and also keep your mind occupied as you transition.
Best of luck,
Anna