I am hoping I am seeing a disconnect here. The FN/Browning Hi-Power is going to be of very high quality. Maybe not custom fit quality, but still comparing a BMW to a Mercedes.
I am a Glock user, however, if I had to grab the pistol that fit and shot better it would be my Jericho (CZ clone.) It is a DA/SA, full steel pistol and it is a very accurate and light shooter. However, my Glock is what leaves the house with me on a daily basis.
So, to echo the sentiment here, if you want to broaden your search a little bit, add the Hi-Power and the CZ 75 to your search criteria.
Otherwise I have to say get the M&P if you like it and it fits you hand well.
It is just my opinion, but just like cars and guitars, you don't buy the best one out the gate to learn with, it doesn't leave you any room to move up. Buying the Sig would be a waste of a lot of features that you bluntly won't recognize or appreciate with your limited experience and could eventually make it more difficult to transition to a different pistol.