We've actually got an old fashioned Silver Cross that I'm seriously considering selling... It's worth a pretty penny and completely impractical for car use 
Anyway... I was very specific in what I wanted when looking for on for Izzy. In the end I bought This Set from that retailer (although I didn't pay that much
) and am really happy with it
Although I'm sure they've updated the pushchair now as I don't think ours has the suspension.
The key thing for us was the fact that the carry cot is licensed for use as a lay flat car seat. We frequently have to do journeys in excess of 3 hours (and already have!) and we didn't like the idea of Izzy being folded up in those carry seats (we only use it for short journeys at present) and also that the carry cot can then be lifted in and out of the car onto the pushchair to give a pram that she never needs to get out of when going shopping.
Since deciding on it someone drew my attention to this research (available in several different sources and formats) which suggests babies shouldn't be in seats for too long.
Anyway... We're happy 
The article is an odd one really. There is no real research behind it. Its is more a list of suggestions to minimise the risk of cot death, based on...., I am not sure ?? The suggestions are very sensible though. But to be honest does anyone actually leave their infant (under 28 days old) in a sitting positing in the car? Most of those seats have the baby at a very gentle angle, if not nearly flat.
The issue with completely flat carry cots are the lack of impact protection in the event of a crash. Which seems to negate the very tiny risk of cot death in a car seat.
None the less you have to be happy with what you have bought, that is probably the most important thing.