Top end aero bikes are sub 7.5kg.
It more so comes down to ride, handling and comfort more than anything but most importantly, personal preference.
My next bike will be as an aggressive as possible aero bike. I weigh under 70kg myself and bike included, going for a bike that weights 6kg would be a waste of time as the aero gains on the flats and downhill (where I need them) are much more apparent than a weight weenie bike.
It more so comes down to ride, handling and comfort more than anything but most importantly, personal preference.
My next bike will be as an aggressive as possible aero bike. I weigh under 70kg myself and bike included, going for a bike that weights 6kg would be a waste of time as the aero gains on the flats and downhill (where I need them) are much more apparent than a weight weenie bike.