I would really say that as well as getting advice from all here, it is important if possible that you go and try various ones in your hand. See how they feel and try to imagine using them for some minutes at a time.
Now doubtless the Cresendo is a great airbrush, but I could never get mine to feel comfortable and sold it.
I have used Badger and like them, but currently have two Aztec, the 470 and all metal model + and my main brush is the Paasch Millenium,with medium and fine assemblies. I have had great effect with the Aztec, but prefer being able to field strip the brush in its entirity like I can with my Paasch.
It is a little bit 'horses for courses' as you may try many before finding just the one that suits you and your style of modelling.
Regards,
John