I have alphadots and lots of circle punches.
Love them!!
SU carried a 1/2 " punch and a 3/4" punch. 1/2 cuts them so the letters still show but the circle is small, 3/4 punches them so there's a white border around the outside of the dot.
I bought a 5/8" stamp from a craft store and it's perfect. I also have the 3/4 and the 7/8 because they're great for punching out layers.
On this card, I used the 5/8" and the 3/4"
Gallery at Splitcoaststampers
HTH!