Aaronw:
If you don't want to deal with ducting there are some booths with charcoal filters available, but you will pay a lot more for them. The nice thing with the Pace booths is they use standard furnace filters available at most hardware stores for a few dollars. Many of the other hobby booths use specialized filters available only from the manufacturer.
You will need the charcoal filter if you do not have ventilation to the outside. Yes, those specialized filters are expensive, but necessary. The standard furnace filters hardly do anything and will dump all the paint particles right back into the room if it is not vented.
Some Artograph user said that the charcoal filter lasted a fair amount of time. But........
I do agree with you that if one is thinking Pace, he should consider DIY.