I'll chime in on Quite Imposing. It works very well. I haven't used it for a couple years. My current job is in the packaging industry and Illustrator is the default program there. But I did work in a print shop for many years before that and they didn't want to spend the money for Preps or anything like that, so we used Quite Imposing. I'm sure it doesn't have all the bells and whistles of some of the higher end programs, but it did everything we needed it to do with no hassle.
I have not tried Absolutely Imposing but I've heard nothing but good things about it as well.