My daily tanks are Protank 2s with an airflow adapter. I rebuild my (single) coils and really love them. I also have the Nauti Mini, and other than not personally being able to rebuild those coils, I like them immensely. Have a couple of Subtanks (Mini and Nano) that I like as well....
When I find something I like, I tend to get multiples. I may have a number of tanks, but not a wide variety, but that's o.k. for me.