I have a Devilbiss Finishline 3 gun. It came with 1.5mm and a 1.8mm tip. Its a good all around gun. You can spray base/clear or single stage urethanes using the 1.5 tip and the 1.8 works good for heavier primers. I've seen the guns for anywhere from $120 to $200 depending on the setup. You can try looking at
www.autobodydepot.net if you are looking for something online.