Hi Lynn,
Yes Price matters. The better paint guns are more consistent with a good spray pattern, They atomize the paint much better, They have a wider fan pattern, And they perform better over the long run than a cheap gun that wears out quickly.
Profesional HVLP paint guns run upwards of $450 and they are worth every penny. The top brands are SATA and IWATA followed by DeVilbiss.
The DeVilbiss finish line III paint gun we use in our videos is the least expensive paint gun we have found that will do a decent job. If i was looking to buy a new paint gun right now I think I would buy the IWATA "Supernova" It will out perform a finishline II paint gun with less air.
Having a paint gun that puts out a 12" fan pattern vs' a 8-9" pattern makes a HUGE difference when you start painting large surfaces like wings and a fuselage.
All our products are shot with a 1.3mm nozzle. Some of the higher end paint guns have different air caps based on what type of paint you are using. Make sure to ask me before purchasing a paint gun which air cap to buy on the newer IWATA or SATA 4000 paint guns.
Make sure you are looking at HVLP paint guns. Research the web for info on each model you are interested in.
Jason