Bianchi Aria is a lovely choice, mine is the rim version but still an brilliant ride.
Partly driven by my heart as I’d always wanted a Bianchi, I’m sure I could have better spec for the money but I just love it, which I bet makes you ride more than having that Ultegra rear mech over a 105.
Also good for tri usage as Bianchi do advertise it as being a good starter tri bike.