The RC2 Installer is thought to be ready, but it hasn't been officially released yet. Get it here.
I have read several reports from people who used it, and they said it worked perfectly.
I have always put Grub on the MBR ... Most people do. Don't know why you had problems.
To use the graphical installer, instead of hitting [Enter] to boot, type installgui, then hit [Enter]. It's altogether possible that the daily build is the same as RC2, but I don't know.