Mum and dad bought our travel system for £400, when LO was 4 months I bought the one you have now, they weren't mad, it didn't work for us when there was a baby in it, I'd keep it though, it's a fab pram when they're in the stroller bit (I never needed the carrycot or anything though) and even if you don't use it, you can say you will as you never know x
I put him in the stroller bit already cos he's so big he looks squashed in his carseat. I do feel bad lol because when she has LO when i go back to work she'll need the pram and know that I'm not using the one she bought lol