For many years I have used my trusty Passche VL which is still available and is comparable to the Badger 175. Solid and reliable.
I also had a Passche H which I gave to a friend who wanted to give airbrushing a try. He still uses to this day. A basic single action airbrush that is solid, reliable, and with practice can do just about anything. A very old design and still available.
I felt like getting a new airbrush this year and got a Passche Talon TG which I quite like.
I looked long and carefully at the Iwata airbrushes but in the end I felt that their smaller bits and pieces seemed a bit too delicate for my liking. Don't take that as being dismissive, Iwata are high quality with excellent fit and finish and capable of very fine work. I just didn't think they were or me.
Never had the opportunity to handle a Harder and Steinbeek airbrush. They seem to be highly spoken of. When I went shopping for a new airbrush I could not find a stocking retailer in Canada so I gave them a pass.
You may find this website has some helpful information:
https://sites.google.com/site/donsairbrushtips/homecheers, Graham