I have an Iwata Eclipse CS and an Iwata NEO CN. The NEO can be changed from .035 to .050 Needle just by replacing the Needle, Nozzle and Cap. I use both needle sizes depending on what I am pushing through it.
I am ordering a Badger Patriot 105 as well, I love its flexibility in terms of spray patterns and needle nozzle sizes.
In short, buying any quality brush seems to give good results. I just can't work with anything other than gravity fed brushes, do not like the siphon fed ones mostly because of the amount of cleanup needed. And its a pain to change colors unless you buy multiple cups. With the gravity feed I just dump, clean, and reload!