In my never ending search for "the" acoustic mic, I bought a SM81 based on the high marks on this board. I did not buy a new mic, but an older SM81, and have to say it just did not do anything for me. Mine seemed to have a harsh sound, not smooth like I was expecting. That was a surprise.
So, I ordered the Peluso mic you are considering, did an A/B between my SM81 and Peluso, sold the SM81, and still have the Peluso. It is not the perfect acoustic mic, but in my situation, was a better choice.
Good luck, Charlie
PS - I am still looking for "the" perfect acoustic mic, so the Peluso may not be enough of an upgrade for you. If you find "the" mic without taking out a loan, let me know.