So many different opinions! Here's mine!
If you are not much of a cook and really only plan to use it for baby food, get the mini-prep Cuisinart (but don't pay $50 like someone said -- frequently on sale at Carson's or Kohl's for $25 or 30 and if you have a coupon, even less!). It will also do nuts for cookies/baking or chop an onion/celery/carrots quickly for basic cooking. I agree with someone that it does have a life span -- I am on my second one (but that's over more than 10 years).
If you are more of a cook, consider the "boat-motor" (Magic Bullet, Cuisinart, etc.) type of devices for their versitility and small space.
I have to tell you that I am quite a bit of a cook, as is my mother, and neither one of us uses the big Cuisinart/Kitchenaid food processor very often -- too many parts to clean that the time you save from doing it old-school with a knife is killed by the cleaning/putting away time. I did use it a little to make big batches of purees to freeze, but only when my baby was in the thick of purees. If you are making purees now mostly for "Deceptively Delicious" recipes or the equivalent, the Mini-Prep will do cup or so needed for most of those recipes with no problem and very little cleanup.
Also, if you don't think you'll use it much, give your regular blender a try first to see if you even need a processor -- the blender will puree fairly well, just not as smooth as the processor.