I have to buy one still. Where is the best place?
I can't help with where to buy one, as i'm in England, but i would definitely recommend the QTI (quiet) version over the standard one. They're great guns, very light and nicely balanced with a lot of power, and the difference in noise between these and other impacts is huge.
My colleague has a Snap-on gun, it's no more powerful but has **** direction change button, is heavy, especially nose-heavy, loud and generally uncomfortable to use.
My first one saw a few months of hard daily use in a tyre shop, when they brought out the (current) updated version i bought that as well, i've now had it for about 6 years and it's never once let me down, it's a great gun.