I echo the sentiments of the people who told you to stick to the Glock for the time being and not start buying other guns before you are proficient with the Glock.
I like the idea of trading in the Gen 3 Glock for an optic-ready Gen 5 Glock. I like the Gen 5 because it dispenses with the finger grooves on the grip that the Gen 3 and Gen 4 had. I would stay away from a Kimber 1911 as they tend to have function issues. I went this personally and it was a mess.
I don't like the idea of adding the Holosun right away. I think it will require more time and complications. How does one sight in a Holosun optic if one cannot shoot? If you go to a beginner's class with a pistol mounted optic that is not sighted in, I am not sure the instructor could accommodate you. If you are going to a private lesson with a gun that is not sighted in the teacher will be able to accommodate you, but it will take time away from other things planned.
Also there is the installation. I would suggest you have someone who is experienced with it install it the optic. If you install the optic yourself you may do it incorrectly and that will detract from your class or your private training.
If you have a Glock with factory sights, it is ready to go to the class as the gun currently is.