My 2 cents: 175 mm crank length for sure at your size. 48 will leave you wanting in terms of top end speed for road riding. A 50/36 or 50/34 compact crank could get you a better range for more varied terrain, and you would survive if you wanted to ride a little bit of cross. A 53/39 would be a commitment to the road, and you would either need to be a strong man in the hills, or it will help you become one.