I saw you are interested in high vapor production, the nimbus is not going to give you that. It's pretty tight on the air and looks more geared for high ohm flavor.
There are a few well priced rda's out there, clones or originals, that are fantastic for the beginner and more experienced alike. Mutation series for example. I recommend the v1 or the v3 of that line. Also the Marquis clone is affordable and can blow some ok clouds and the flavor is excellent. It's a well designed rda all the way around.
I suggest hopping on youtube and watching some reviews. Beware, some reviewers will praise EVERYTHING they vape so you have to kind of gauge their level of praise to see what they really like and what they don't, but in the end your mileage will vary. If you see something that looks incredible but the price tag is huge, google the name and add "clone" on the end and save yourself some buyers remorse.