Has been 9 years since we needed that, and about 17 since we purchased anything new in that area, so I doubt our experiences with specific brands can help much.
However, I have some general recommendations:
One recommendation is to steer clear of the combo units that are stroller and car seat all in one (where the car seat is the seat in the stroller and detaches). Also, steer clear of the car seats that have a detachable base and you can carry the infant around in the carrier. They seem like a space safer and a convenience, but they are a little more complex than having seperate/dedicated units, and often your child outgrows them quickly...and they are often more costly than purchasing seperate/dedicated units.
So, I recommend getting a good car seat, and get a good stroller, seperately.
Also, I recommend that you install the carseat semi-permanantly; meaning that you don't plan on taking it in and out all the time as some think they will. That's just a headache. Lastly, put a mat beneath it, especially if you have leather seats. But make sure the mat doesn't compromise the secure installation. I suggest the mat because you'll be amazed how much crap accumulates around the kid and the wear that the car seat can generate.
There are lots of good, one-hand collapsable strollers out there. Graco was the Cadillac at one time, but who knows now. Get big wheels, lots of pockets, and a rain/wind cover.
Good luck...
TJR