I really, really wanted one of the old fashioned Silver Cross ones - a Kensington or Balmoral. Literally everyone I spoke to convinced me this was not a practical choice for life in zone 1 London in a second floor flat.
So I compromised with a Silver Cross Pioneer. It was sort of practical, in that it can fit a carry cot, a seat or a car seat and can fold up, but 90% of my reason for picking it was aesthetics.
Part of me loves it, not only because it looks gorgeous, but because it manouveres well, is a great piece of engineering, and seems really comfortable for the baby. On the flip side, it weighs an absolute ton, making it hard to get up and down stairs, onto buses, or into taxis (I don't drive). It's also pretty long and wide, which makes getting it around shops and into restaurants a bit of a challenge. I usually walk 40 minutes to work though, and DD will be going to an in-house nursery once my maternity leave is over, so I think it will really come into its own then - it's fab for long strolls.
After a couple of weeks - particularity because an unplanned C-section had meant I couldn't really lift anything - I had to accept it wasn't ideal for every day, so I supplemented it with a Silver Cross Jet (yes, I love the brand, what can I say!). That's the opposite extreme: super lightweight, folds small enough to fit in hand luggage. It's brilliantly practical, but I don't feel it's comfortable enough for longer journeys, especially while DD is tiny. The combination of the two works pretty well though, even if I'm slightly traumatised by our overall pram spend!