As a commuter, child carrier and occasional leisure ride machine, I use a Kinesis Crosslight (it has mounts for rack, mudguards etc) that I’ve had for years (everything’s been changed other than the seatpost, it’s like Trigger’s broom)
Although fatter tyres aren’t ‘fast’, I prefer to be able to use robust, off-road-able 35mm Land Cruiser (or similar) tyres than 23-28mm slicks. 2 punctures in many years of use.
I prefer drops for commuting, but I currently have flat bars on it (due to a broken STI shifter lever), but it does allow V-brakes that give much better performance than the old Cantis.
Panniers and a rack (that prevents the bags hitting the spokes) give far superior comfort to a rucksack/messenger bag, although the handling can be a bit funny.
I can recommend carbon forks.