Deffinately light weight, I also got a pram that is suitable upto around 22.5kg... So about toddler. Don't have to buy another one. Same with the car seat, I got a reversible so infant through to 2 years old. I am big on shopping smart.. Lol
There are soooo many brands, it is overwhelming. Even for me on my third. For a car seat, I have always used Graco. With my first two I have a Graco snug ride and now we got a Graco click connect 35. I have always bought the Maccleran stroller. Techno XL I believe. Mine has an attachment for the infant car seat and an attachment to turn it into a bassinet stroller. It all depends what you are looking for. I suggest light weight stuff.
In Australia there is a site called kidsafe that rates all available car seats, prams, strollers, cots etc that are available. It rates everything from safety through to prices. Just wondering if perhaps the US has a similar site!