Best stroller/car seat combination?

Hi ladies, I am going to be 20 weeks on Thursday. I'm starting my registry and wanted to know what you think is the best traveling set aka stroller and car seat combo? I'm going to stop in babies R us and check them out in person- but wanted to know your thoughts on a) what's easiest car seat to click in and out of the car/ stroller b) what's the lightest? I feel like I am constantly carrying crap and really looking for something light and easy. Thanks!