As far as the type of vehicle I am and SUV girl all the way, there is no way you will get my in a car or van. I like being higher up off the road so to me it's a personal choice. I have had 2 Explorers and I think I would have been able to get three seats in the back, both had lots of cargo space plus storage on the roof with a roof rack. I currently have a 05 Land Rover LR3 and I think three would fit there to but it's horrible on gas but with no car payment it's fine for us. DH and I usually buy only used cars, we have found that we can afford a nicer car for our money than if we bought new.
As far as the endless trips to dealerships try Carmax if there is one near by. Tons of vehicles, all makes and models so it make test driving and side by side comparisons a snap. We did this and it was great but we ended up finding my LR3 at a dealer near us and got a better deal.
Hope you find what you are looking for. Oh and test fit all car seats when doing the test drive this way you know for sure that they will all fit.