i know you are looking for just one semi auto
but, theres too many out there to settle for just one.
i set out to get a 1911, but after weighing the price vs options, I opted to get a .45 XDM and a .22 Beretta Neos.
for both of those it ran me in the $1000 range. which is about the price for a good 1911, if not cheaper.
I like the option of shooting different calibers out of different guns. that way I can switch back and forth with absolutely no delay.
if you want to practice with the same gun, but in a cheaper ammo, thats different.
but i like that i'm shooting 2 different guns, gives me 2 different perspectives.
nobody mentioned the Neos. its a good, very inexpensive .22 semi auto that comes with a rail on top so you can mount optics if you want very easily.
I have a red dot sight with 4 different reticles. easy to point and shoot. it looks a little odd, but its fun to shoot.
just my 2 cents.
let us know what you decide on.