I bought a Maclaren Volo* and absolutely loved it. 6+ years after I stopped using it it is still going strong having been used by two nieces and now a nephew. I really recommend Maclarens for portability and ease of use, although they may not be good for the 'offroad' kind of walks (but it was fine on a beach).

* Not one of the suitable-from-birth ones, but in retrospect I really wish I had got one of those (Quest, Techno XT, etc).