Like everybody said here, buy a bike you will be happy to ride on, make you stare at it randomly(sorry I do that sometimes;
. Rest of it doesn't really matter much at least for me. I am not racing also don't need to have KOM on Strava so couple kg of extra weight doesn't bother me much.
Oh and one more thing buy the best bike you can afford. I believe everyone deserve a nice bike if you can afford it. Doesn't really matter if you are doing 9mph or 30mph, it will make you happy.