Installing 14.04 alongside Windows 8.1 EUFI

I purchased an Asus R751JB laptop with Windows 8 pre-installed. I've upgraded it to Windows 8.1 and now I want to install Ubuntu 14.04 along side it.

I've modified the BIOS to turn off fastboot and secure boot. I loaded the Installing ISO onto a USB drive and booted onto the live update via UEFI.

The hard drive was not completely used, so I was able to add partitions following all of the Windows 8/8.1 partitions. This is how the sda drive looks (I am in the installation of 14.04 -- I haven't actually installed it yet)

/dev/sda1 efi <-- this is where the EFI directory is located
/dev/sda2 ntfs <-- this is the Windows 8 re-install stuff
/dev/sda3
/dev/sda4 ntfs <-- this is where Windows 8/8.1 is installed
/dev/sda5 ntfs
/dev/sda6 ntfs <-- this is the Windows 8/8.1 recovery
/dev/sda7 ext4 /
/dev/sda8 ext4 /usr
/dev/sda9 ext4 /var
/dev/sda10 ext4 /usr/local
/dev/sda11 ext4 /home
/dev/sda12 swap

I know that lots of people don't like to have separate partitions for /, /usr etc. but that is how I would like to set up my machine.

My question is: what should I specify for the "Device for boot loader installation"?
   /dev/sda
  /dev/sda1

BTW, the /dev/sda1 filesystem has a BOOTSECT.BAK file and an EFI directory. The EFI directory has ASUS, Boot and Microsoft directories.

When I first tried to install it was from a LiveUpdate DVD that did not boot from UEFI. I was never able to boot into Ubuntu -- it goes directly into Windows 8.1. I tried running boot-repair, but all I would get was a message telling me that I needed to shut some things down and try again.

Edit: swap is just swap, not ext4