I like SATA and Iwata. I own an IWATA LPH 400. The Iwata's are great guns and use VERY little air and very little overspray. I was used to old style guns with higher pressure and a faster pace when spraying so it took a while for me to get used to this gun. With the Iwata you will move slow and it lays down a great pattern. The stock cap with it is the silver one and it does great for clears and basic base coats. I have used it for metallics and it did fine but they sell what they call their "purple base cap" that is great for metallics and now they even have an "Orange cap" that is supposedly even better. The caps are about $100 bucks but the stock silver should be fine.
In the end the Iwata will save you on paint material, time as far as having to wetsand or fix blemishes, etc. If you only plan to paint about one car then you may just want to purchase a mid grade gun in the $200-$250 dollar range or you can buy the Iwata and sell it online to someone and make some money back. It's all up to you on what you plan to do in the future with painting. I have even sprayed primer with it with great results. I would recommend the 1.4 tip.