I think I spent a year researching and test driving minivans before we finally bought one this summer. LOL! We went with the Mazda MPV and I love it! I especially love the way the rear bench seat folds down flush into the floor. It's so much easier than having to remove the seat when you need the extra room. Even my 7 year old can do it by himself! I also love the way it drives. My second choice was the Toyota Sienna.
Despite all the rave reviews for the Honda Odyssey, I just didn't care for it at all. It seemed almost sluggish compared to the Mazda when driving it, maybe because it's a larger vehicle. I also didn't think it was as comfortable for some reason.
Bottom line, you need to go out and research and test drive them all to see what fits you best. There are a lot of nice minivans to choose from.