Hi monkey, I see you already ordered but some thoughts here from a vista owner!
LOVED our vista until number 2 came along 17 months later. We bought it because it is light, huge basket and we used the bassinet for sleeping for almost 4 months.
Live in London, walk MILES every day, in and out of shops and on buses. Car very occasionally and fits in small car fine when needed. Yes, v occasionally you'll bump things because of the width but I've never not been able to get in/on anywhere and it hasn't caused fluster doing so. It does fit down the aisle on the buses on our route (note that some are narrower than others ) but you can always board at the back which is easier anyway.
Access to huge basket is not very easy with the bassinet but no problem with the pushchair. We've moved into pushchair with infant insert at 4 months.
We were really sold hard on the fact it would convert to a double with the rumble seat but were not thinking when that would be or giving it much thought. With 2 (17 months apart) it is ridiculously heavy to push and they both get 'dropped' down curbs! The weight is all on the small 2 front wheels with the toddler (who can only see out the sides if that bothers you, and doesn't have that comfy a seat to snooze in, although mine has managed). Our suspension with 2 is pretty much bust.
If you want to future proof for two babies close together, consider the Phil & teds amongst others. Whilst I love my vista, using it for 2 has totally put me off it. If you're not concerned by that the vista is ace and was a good investment for #1. We got a maclaren too as did everyone we know for zipping about, but only when #2 arrived as the vista was so comfy and never had a need for another. Easy to steer one handed whilst drinking coffee, SMSing too
Oh and get some buggy clip things to hang shopping off regardless of huge basket. I promise you'll use them every day. :)