cushioncover: "Most parents start off (quite rightly) buying a pram where a newborn can lie flat all warm and comfy. Then buy a cheapy buggy when said child reaches at least 6mths or perhaps walking."
'Swhat we did. Proper Silver Cross pram (eBay) for the start, mainly used as a mobile cot for the garden. Then a cheapo buggy (eBay) for occasional grandparental use. It's Silver Cross branded, but identical to at least two other makes - somewhere in China bashing them out for rebadging, I think.
"3 wheelers really are the only ones suitable for walking off road"
We tried a few 3-wheelers off-road (ish) for the test and just found them to be a pain. The central front wheel means the child has to sit higher than in a 4-wheeler, so added to a smaller wheel base they were much more toppleoverable. Of course the bigger wheels are nice, but I couldn't see the threewheelness as more than a gimmick.
Actually, I find all pushchairs a pain, and never use ours. My Vaude backpack (Freecycle!) is much easier and more companionable. Of course I may change my mind as The Boy swells to more than his current 12.5kg...
But the main thing, I think, is to try a ramge, find a solution which suits you and your situation (town/country, small/large/no car, height etc) and not to be seduced into thinking that only a hideously complicated "travel system" - all aluminium and useless mesh pockets (Jané, I'm looking at you) - will do.