Honestly,..save your money for more tackle!! A SS prop on a 60 hp motor would cost you more $$ than you'd ever gain in performance. You "might" gain 1 mph in top end, but SS props are expensive to replace and/or repair if you ever clip a rock or a stump. Aluminum props are much better on motors smaller than 90hp. You could buy 2 new aluminum props for the price of one SS and then you'd have a spare. PLUS,..aluminum will bend easier than SS and that alone may save you a propshaft!! THAT is an expensive repair,..trust me..I know!!
When you upgrade your boat and get into one with a 115HP or larger...then you are into the SS category!