I highyly recommend the GRACO brand carseat/stroller combo.
They have 2
1. Graco Snugride carseat/stroller the carseat is awesome the only drawback to some is it only goes up to roughly 20lbs and alof of babies outgrow it quick.
2. Graco Safeseat32 carseat/stroller this carseat is bigger and will hold a infant to 32lbs. My 10mo.old has this and is nowhere near outgrowing it, with plenty of room. When the carseat get's to heavy to lug around I just leave it in the car and unbuckle her as I go.
The carseat/stroller combos are AWESOME, you don't have to take a sleeping baby out of their carseat, you simply take the carseat out and snap into the stroller and away you go. Typically the infant carseats with the handle fit newborns better too.
Alot has changed in the last few years they are now pushing for babies to rearface in the car (face backwards) up to 40lbs around 3-4 years of age. So you will need to think about that when choosing carseats.
Graco is one of my favorite brands! I've tried many brands with my kids and many styles and I have no complaints with Graco. I have owned over 15carseats in the last 8 years. I am super duper picky and GRACO is the way to go for infant seats. When they are toddlers and get a bit bigger I love Britax.
My other favorite brand is Fisher Price, now they don't make carseats but they make tons of baby products that are just mind blowing. I love Fisher Price.
One brand to steer clear of is Cosco which is also Eddie Bauer,Safety First. Their products have frustrated me and haven't held up like I've expected. I would never throw my money away on that brand.
Go play with baby stuff at Babies R Us that is the store to actually touch,play with, and get your hands on. The store associates don't always know what they're talking about though just a FYI.