I use a millenium. I works great. It's built well. I bought it at everhartsales.com for about $280. I really like it. Another gun that's great is the Iwata (LH400 I think). It covers really well with a lot less pressure than the GTI so you have less overspray. The only problem is that it costs over $100 more than the GTI.
I have no complaints about the GTI and I'll use it for years and years.
FT