Our little lad is 5 months old now so the whole push chair/travel system choice is still fresh enough in my memory to be able to chip in to the thread.
We got a MacLaren xt. It's small and light without looking cheap and nasty. Is suitable from birth because it can lay totally flat inside. Folds up nice and small for the car boots, is light enough to lift without getting a hernia.
Originally I wanted an all singing all dancing travel system, but I spoke to quite a few people who bought these then 3 months later bought a more modest pushcahir because what you really want is something light, easy and manouverable for car/shops etc.
We also bought a really nifty canvas sling, so when we go walking off road the wee man goes in that.
I was concerned that when he was very young in the pushchair he would be facing away from us and might not like it. Need not have worried, when very small he just fell asleep almost straight away, now he loves facing forward to see where he's going.
Honestly, it's very tempting to go big and expensive with these things but there really isn't any need.