I was thinking about that but I already have 1600+ miles on this cassette and chain and I only got them in January. The chain has a tad bit more than .050" and less than the .075" stretch (based on Park Tool chain checker) so I figure I would just buy two cassettes when needed when I order a new chain and see if the wear on the cassette is enough to warrant changing. I doubt it but can't hurt to check. I do not want to put into use a new cassette on this old chain.

For now, I have no need for the other set and can wait. Might even get one 11-32 and another 11-25 or 11-28. Need to see. I have been getting stronger but I am not sure I can yet give up my 32T gear for the 10-15% grades. It is nice to have it when I just want to take it easy on a climb.