I wanted an SUV too, but monitarily we couldn't afford one. We went with a Minivan and I'm soooo glad we did. I can't believe how much I've filled up the back on trips up to my parents. There's no way all that stuff would have fit in a SUV.
My husband has a 4 door car and though he can get the boys in, there's not much room to work with when tightening the harnesses ect.
I think Mazda's and Kia's are pretty affordable, even comprable to the price of a car, if you get a good deal and it's year end, so you might be able to get a really good deal on a 2007 model.
We personally have Mazda's and I like it. I have a friend with a KIA (I believe) van and she likes hers. I have never looked at Honda and Toyotas, but I hear Toyota's are pretty much maintain themselves. Crysler is kinda expensive and I'm not sure about Ford.
I'd look into a minivan if you can. THere's so much room and with all the fold down seats now, they are easy to haul passengers in when needed and fold down when you need more room to haul all the baby stuff.