Cuisinart is tried and true and my favorite. Just bought a new one to replace my aunt's that was from the 80's. I have the 14 cup one because I make a lot of food sometimes for my clients and classes. I like the option to be able to make more food and save for later, but if you buy the smaller one you are limited to making small batches or using it over and over.
Food processors are similar to blenders in many ways. The primary difference is that food processors use interchangeable blades and disks (attachments) instead of a fixed blade. Also, their bowls are wider and shorter, a more appropriate shape for the solid or semi-solid foods usually worked in a food processor. Usually, little or no liquid is required in the operation of the food processor, unlike a blender, which requires some amount of liquid to move the particles around its blade.
Hey Renee, I have a Cuisinart blender/food processor combo that I bought from Costco for about $60. I've been using it for 9 years and it still works great. When you do buy one, just make sure that the blades are sharp, that it comes with some attachments (for grating, slicing, etc.), and that the bowl is made of a strong material; you don't want those flimsy plastic bowls that will crack over time. Stick to a major brand and you should be fine. Oh and avoid anything advertised on TV infomercials.
I found out that lots of food processors have BPA and other chemicals in the plastic that can leach. Apparently the wide mouth food processor by Hamilton Beach is free of BPA... as are a few others in the higher end. Hope that helps!