Hi,
About installers:
I don't know the most recent Debian installers, so I would have to grab an all made distro such as the one I pointed to for konaexpress recently, give it a try, and see what it offers;
I do know the two types of installers provided for Ubuntu : the one in alternate, which comes directly from the non graphic former debian installers. It needs practice and knowledge, and is very handy on low resource machines where it can save my day; It provides several methods, including LVM and RAID, expert mode, and I think I remember an automatic mode too.
I never use automatic modes else than in Virtualbox, because it makes the swap partition too big, often at the end of the hard drive, and then installs all in one single partition.
I know the graphical one, Ubiquity as well. Ubiquity offers all the choices : install automatically, install besides an existing operating system, and "something else", which is the advanced mode (it used to be called "expert mode" long ago). In the Ubuntu boxes we have Gparted in the live, and it is also in the post install script to be removed at the end of the install : once the distro is installed on hard drive it is not there anymore. The use of Gparted is up to you. You can use it before starting the install if you wish, or you can use only the one available in the Ubiquity installer. Or let the installer do it for you.
So there is an automatic mode to install.
PCLinuxOS : also has an automatic install option. The partition tool there is a mandriva tool, drak-something, and does not default format the partitions based on "mio" as parted does, but on cylinder, therefore it creates a distortion between partition tables if we use once one, and once the other. It has lead my installs to be borked twice in several year's time until I find out why it is not good to use one then the other.
Tools to remaster : Remastersys for Debian seems to work well. For Ubuntu, Ubuntu Builder is what I have found to work best up to now. And next I will try some scripts made by someone else, which allows to start from a debootstrap (a ubuntu from scratch-like). But not quite now, because I just uploaded 3 new versions of ubuntu openbox.
Taco.22 : you can remove some of your isos from Dropbox if you want to rely on this webspace:
http://tyruiop.eu/~melodie/Downloads/ISOS/Debianjust let me know if some ISO is or are missing and I will "ssh" there to "wget" them.