My first would have been a Humbrol "airbrush" (really a fancy looking minature garden sprayer) some time in the latter half of the '70's followed a few years later, after its demise, by a Badger 350. Both of these are now long gone.
I now have a Badger 200 (older version with the 100/150 series head), a cheap Chinese made B150 clone and a Sparmax SP-35C (double action, gravity feed).
The B200 is great. Excellent results and easy to use (though it doesn't see a lot of use these days).
The B150 clone hasn't seen any use beyond a couple of test sprays shortly after I got it, but it gave better than expected results for a $30.00 cheapie.
I've had the Sparmax for about a year now and I love it. Very fine spray pattern, very smooth delivery, with very precise control of paint flow. This is now my weapon of choice.
This model (SP-35C) is very similar in appearance to Iwata's HP-C+, but I don't know if the similarity is merely superficial or if it runs deeper.
Am I the only one here who is using a Sparmax?