Get the SR1911 and the CMD version or maybe CMD-LW. Let me explain. Have a P90 and several of the SR1911 series. Below the P90 and my SR1911CMD.
Now the P90 is about 33.54oz and the SR1911CMD, being an all steel gun is 36.65oz, both with an empty mag. But look at the sight radius of both.
Now look at both of them from the top....
I have been wanting to take them both to the range on the same day with the same ammo and shoot them back to back but have not gotten around to it yet. Of course now I have the SR1911CMD-LW, but it is lighter than the P90 at 28.76 ounces with an empty mag.
Then you get into the problem with replacement parts or even extra mags on the P90 compared to the tons of parts you can get for 1911 type pistols. You see on other forums where people have basically put tons of aftermarket parts on the SR1911.