Heh- nice one Gazim.
I have a Taiwanese knockoff of a Binks gun that I bought before HF started offering their guns. Its ok, if I was painting more I would get one of the guns that lets you use the bag system.
I like a gravity feed gun- you just have to make sure you have a place to hang it while you are setting up- nothing is worse than filling it with paint and realizing you don't have a hook to hang it on while you are fiddling with your parts.
As for the tip size, there is typically a range specified with the paint you are using. Go outside that, and there is no guarantee that your paint will atomize right. I like a tip size about 1/3 of the way up from minimum- I tend to get runs when I'm not careful, and I like to work a bit on the slow side. Usually primer needs a bigger tip, which is one of the reason a lot of people have a separate primer gun. I like to have one around with 1.7mm for paint and 2.2mm for primer.
Oh, and I have a 22, a 38, a 7.62x39, an 8mm Mauser, and a 54 Cal black powder.