Campy cassette

I currently have an 11-23 cassette and am trying to decide between the 12-25 or is it overkill to go with the 13-29? Thanks.

What about a 12-27?

I checked another source and they have a 13-26.

I have an 11-23 and a 13-26. I keep the 23 on my training wheels, 26 on my racing wheels. The 29 will work if you have the Daytona or Centaur group, or the record or chorus mid or long cage derailleur, otherwise the max size recommended by campy is 26.

I live in a pretty hilly area, and getting the 26 was one of the smarter things I have done.