Can't speak for illumiquest, but dust inside of lenses is an incredibly common "thing" (not even an issue, really) straight from the manufacturer and I've never had an issue with small amounts inside of lenses showing up in photos, much less causing problems. I'm not trained in optics, but I imagine this has to do with the fact that they're right up on the glass elements, kind of like if you have a speck of dust right on the front of your glasses and they're right in front of your eyes.
Looks like a nice camera and if I wasn't on a mad dash to sell some of my things, well.... I'd have to think long and hard about it.
-steve (who doesn't have the money to have GAS)