Hi,
some more points:
disadvantage of step in crampons that is that they only work with special designed boots, but cannot attached to others. They also fall off if you manage to destroy the front part of the boots (e.g. because of walking/climbing).

I have checked your HP to find some more details about the planned usage (found mt. Washington). Based on this you don´t really need such crampons. We normally use such crampons only for steep ice (icefalls, north faces).
I own several pairs of crampons and use the following combination:

Summer, glacier, maybe max 50° in few parts -> La Sportiva Nepal Evo / Grivel Airtech "new matic"

Summer, north face -> La Sportiva nepal Evo / Charlet Moser M10

Winter, north face, ice climbing -> Scarpa Alpha / Charlet Moser M10.

If needed, I can attach the Grivel to my softer boots. If possible, I avoid the M10 because they weight more than then Grivel Airtech.

Becks