I shoot nothing but Iwatas for the past 5 years and they are IMO the best on the market !!! but they are rather pricey !
I dont know of any gun that comes with several needles for spraying , but if you can find an Accuspray Issac 07 gun in a 1.5 needle with a 705 air cap this gun will shoot base coat & Clear coat very nice ! I have had this gun for 18 years and all my helpers seem to gravitate to it because its an easy gun to set up and control .
I just went to spraygun Depot web site and they have them , but since 3m bought them the guns have doubled you could pick one up for around 250 bucks now they want $445

I have never used one but you could try an Air Gunsa AZ3-HV Spray Gun from Iwata , dont know the price of one but you can go here and check .
http://www.asetusa.com/
Also join the forum and ask about it