if you want to learn, gentoo is your best bet IMO. It rather forces you to learn =]. In SuSE you have things like YaST, which are cool, but wont help you learn =P
But I cannot mount the boot loader on the MBR of Windows or it wont boot.
who told you that? o_O
you sure can put the bootloader there, it will contain a seperate entry for windows, and one for linux (IE you boot up, you get a screen with a choice, linux or windows).