Hello Beau,
your Geforce gtx 750 is from Nvidias newest series with Maxwell architecture and too new for nouveau.
You should be able to boot with Safe GFX Settings (the second menu entry in the boot menu). Theese parameters "nouveau.modeset=0 xmodule=vesa" will create a suitable xorg configuration for the xorg vesa driver.
After installing siduction you can proceed with the nvidia driver from debian unstable non-free repository. For future driver support also enable "contrib non-free" for the siduction/fixes repo in /etc/apt/sources.list.d/siduction.list.
You must remove the "driver vesa" from your xorg.conf.
Also make sure that no modeset parameters are left over in your grub configuration in /etc/default/grub.
apt-get update && apt-get install nvidia-driver
This will install all needed packages, compile a module for your kernel and update your initrd and grub config.
You need to create a conf-file for your xorg to use the nvidia driver - please refer to the
manual.
As last step: reboot to your new xorg config.
Feel free to start "siduction-irc" for additional support.
greetings
musca