We went to kiddiecare in Peterborough to look at all the makes and models then hunted down a second hand jobby. I would recommend Maxi-cosi, because I think they look cool. In all seriousness I can recommend getting what they call a system these days, meaning that you have one frame and wheels that works with the travel cot, the car seat and later converts into a proper toddler buggy.
And if you're over 5' 5" make sure you give any bugger a proper test push, I'm 6'(ish) and can't push our youngling's buggy for more than half an hour without my spine crumbling, it's just too short. I'm also lanky, which means I have to walk sort of beside the buggy otherwise I kick the back of the seat when I walk, and for some reason the wee one gets annoyed with that.