Nice looking pistols M1.
I just installed a Holosun 407c on a new, optic ready P10-c, the price was about $225 on Midway last weekend. I have the smaller multi reticle 507k on a Sig 365xl and really like it. I only use the 2 moa dot so I was able to save over a $100 by going with the 407c, I ordered the green dot model and dry firing in the basement I really like it so far.
If it were me I'd chose the bigger glass for the P07, for the narrower slide top on my P01, I think I'm going with the 507k again, it's about a quarter inch narrower.