There is quite a bit of info in the graco forum. It depends on how much paint you will be using with it. My recommendation would be a near new titan 440i from Ebay (5-6 hundred), they will spray all you want, everyday, if you rebuild it. If you are going to shoot 200-500 gal/yr. a wagner 3/4hp twinstroke DIY pump (@$500 new) will shoot as well as anything but you wont get the same totall output (lifetime). If you are going to be doing wherehouses a pump @1 gpm. will last longer, shoot with 2 guns at once or a large tip size, and go through more paint between rebuilds. I think getting a basic unit and learning to use it works best, then after you're making good money with it get the rig of your dreams.