I would encourage you to have a look at EngageIT VDP by Konica Minolta. This is a pure plug-in based VDP tool that works directly with Adobe InDesign. This means you can take advantage of any feature that InDesign offers, many of which cannot be supported in standalone applications like PrintShop Maiil and Fusio Pro. It is really easy to use, but incredibly powerful. There is a great set of videos on their website at www.EngageITVDP.com/videos. They have a version that produces PDF and PDF/VT output with all the bells and whistles (rules/conditional logic, automatic copy fitting, multi-up support, etc.) for around $900. This is based on DesignMerge software, which is another great choice (www.DesignMerge.com).