Currently I am riding 52 Caad10 Track. Because its track geometry I dont feel perfectly comfortable and I prefer more upright position. I also have been craving to buy a Cinelli and I found two good deals but with the sizes I have never ridden. I found Cinelli Vigorelli Steel frame set small size (50) and Vigorelli Aluminium large size (56). I can either buy one of these two or pay extra 250$ and buy size 54. What would you suggest?

My height is 1.73 and inseam 77cm.
Caad10 track (M) 76cm standover 51.4cm stack . 40cm reach
Vigorelli Alu (L) 81cm standover 56cm stack 40cm reach
Vigorelli Steel (S) 77cm standover 51.5cm stack 39cm reach