I have started getting back into the hobby after a few years away, had kids so all my other hobbies and them took all my time. Needless to say I am starting to restock supplies. I mainly do armor, figures and aircraft and had always used Tamiya paints in the past but now I'm finding a lot of other options for airbrush paints, weathering, diorama materials etc. that offer a larger variety of colors. I am not a person to over concern myself with being period/time correct, so markings and paint shades are not priority but quality is.
AK, Ammo, Vallejo, Tamiya are all products I'm interested in, I do have Vallejo for my figures but have not tried their air line, I have become quite intrigued with all the products from AK and Ammo, they both offer paints along with washes, filters, pigments, all kinds of goodies- oh hell

What products have you used that have worked well or not and any tips you can offer that you have learned along the way, use of particular thinners, flow improvers etc?