ahNah,
You want the car seat which can attach to stroller? But this type of car seat can only sit infant till 10-12kg. And it's heavy when you have baby, car seat on stroller. And some car seat took some time to fit into the stroller. My hubby was laughing at it, saying the bb will be traumatised with all the pushing and tugging the car seat.
Also, you have to make sure you try out the stroller to get a feel. Some feels really filmsy and if you are tall, try to get something with taller handle or you will get backache or kept walking into the back wheels. And some strollers folds up onto the floor while some can fold standing up. I find a hassle to bend down to pick up the stroller.
Sorry for the long post. Hubby and me have explored almost all the strollers and car seats on the market. so, just sharing our findings.