Andy
23's front and back. Continental. Black. The best you can afford. It's your only contact with the road. I know to my cost. ( I had Specialised on the front when I came off, red ones). Wouldn't ride anything else. 100 psi is ok but they will take 110/120 to race on.
Tim
PS We rode 18's or 19's on the front and 21's on the back in the 80's for racing and training in the summer.