I think one of the first things you need to do is figure out what you want from a stroller. And second, figure out how much you want to spend.
Does size matter? Do you have a small trunk? Do you exercise alot? Need something for walking/running? Those are the types of things I would consider when choosing a stroller.
One suggestion would be to get a 'snap and go' from Babies R Us while you decide. They're super cheap ($50?), are easy to break down, and are totally practical with an infant carseat. Once your child gets older, you can decide what type of stroller will best fit your needs (and the needs of your child).
My best friend is really active. I suggested that she check out the Bob's Jogging stroller. You can purchase an attachment that allows the infant seat to click on. Then once the child is bigger, you can take that part off. They're super easy to put up and down, and honestly, they don't take up much room when walking through aisles while shopping.
Before my daughter was born, I swore to my husband that I 'needed' this expensive stroller system. It starts off as a basinette or you can click on your infant carseat. Then it also converts into a 'normal' stroller. While I still love it, I found that it wasn't that practical as she got older because the shoulder straps were too big and there was no way of making them smaller. So as soon as she figured out how to take them off, she would try to stand. SO not good. So I now I don't think big systems are necessities at all.
I also got a Maclaren when we were traveling. I will say that is the BEST umbrella stroller I've ever used. It's SUPER easy to put up and down, and it's great for your back. Try pushing the $12 one, and then use a Maclaren. It's a dream! I keep it in the back of my car at all times and it hardly takes up any room. (don't forget, a baby isn't supposed to use an umbrella stroller until they are around 6 months)
So all that to say, if you're not 'set' on anything in particular, I'd go with a 'snap in go' for now, and a Maclaren for later (but I know you said you didn't want to buy 2 strollers). For joggers I'd check out the Bob's, or Phil & Teds.
Good luck with that! I know it can seem really over-whelming, but you'll find something soon!