My preferred way of installing Debian is booting from a livecd like Knoppix and then using debootstrap. This is a fast and flexible way of getting a system running and results in a very clean installation. Unlike the old Debian installer and the New installer, this makes setting up an entire system on a software RAID 1 system very easy. Besides that, Knoppix supports more hardware than Debian installation CDs. I documented very simply and clearly how I prefer to install a basic Debian system.