W&N series 7 are indeed very nice brushes. Although theyre expensive, your paying for the reputation
If price is an issue, most brands of Kollinsky Sable offer a very high quality. Rosemary & Co are one of my fav's, a small company based in Yorkshire
UK. Other popular ones include Kolibri, Da-Vinci, Dick Blick, Raphael... and many more
Just be sure to go for Kollinsky sable over the synthetics or other kinds of sable (red sable, or sable blend).
Aslong as you use brush soap / preserver, and take good care of them, they will last a very long time - theyre actually water colour brushes, so using them with acrylics means you will need to be thinning the paints down a fair bit, and to ensure you clean it all out well at the end.
As for airbrushes, I'm a big fan of Harder & Steenbeck, but all the big name brands are big names for good reason! Take care of it and use good quality products in it, and it will last a life time.
H&S Evolution Silverline is a very well performing brush with easy maintenance. Mines still going strong after about 3 years now, only had a single nozzle/needle replacement.
Paint for airbrush, I have good success with thinned citadels using Vallejo airbrush thinners, and prior to that I enjoyed Liquitex Airbrush medium (Vallejo one feels better to me so thats the new fav)
Vallejo Model Air paints are also very easy to use and spray well out the bottle mostly, some need a tiny amount of thinner adding for using in my 0.2mm brush.
As Airbrushes go, H&S arent the most expensive.. thats iwata
it kind of depends where in the world you are and what is available locally, and what spare parts you cna get easily. This is why we see a lot
fo Badger reccomendations; lots of American users. Now Badger are fine airbrushes, but in Europe we have Harder and Steenbeck in Germany, and theres iwata in japan. Im not sure where paasche are (usa?). as a note Vallejo bundle H&S evolutions in with their airbrush paint sets.
I know we can get global shipping and get whatever we like, but it being produced closer to home usually means you can get a better price.
Airbrushes range from £20 for a cheap thing that may or may not last (bit of a gamble), upto £2-300+ for high precision detail brushes that can resist harsher paints,thinners and lacquers rather than the easy going acrylics we usually use.