I'd say that the Cavalier USS-64 would be close to the CSS-64, but maybe add $50 due to the USS being able to vend cans/bottles.
Cavalier USS-64 - $250 - $450
Noted..I'm not as knowledgeable on that machine, but I know it's versatility makes it one of the more desirable of the square tops.
Versatile yes, however the USS-64's bottle door is butt-ugly, the CSS-64 is the more Iconic "Coke" machine in my opinion. Side by side by side, the CSS wins in the good-looks department. So there's my 2-cents