2020 specialized tarmac worth it?

I have an SL6 Tarmac and really enjoy the geometry a ton. For a bike that can be raced on, it’s actually pretty comfortable. You would probably be better suited to a 56 cm frame than a 54 at your height. I’m two inches taller than you and fit the 58 cm. Tiagra will get the job done and leave you a path open for future upgrades if you’re into it. Depending on how your roads are, you may be interested to know you could officially run up to 30 mm tires, but in reality, probably wider.