You can download the 7 ISO's if you want but you would not need more than the first one if you have a fast connection.
Or you can just get the ISO for the net install, at the end is the same thing, you can install all with just the first CD.
During installation you get to configure apt-get, if you have many CD's, the installer will ask you to insert each CD's to scan it for packages, but ALSO you will have the oportunity to chose a internet mirror to download any other package.
IF your Xserver (GUI) does not work after install... reinstalling Linux will not solve NOTHING, is not like windows :P that would be a waste of time, what you need to do in that case is to do a PROPER configuration of the installed distro. I learned that after 12 installation in a row LOL... then I learned how to configure my xserver.
What made me chose Debian was it's pure Open Source philosophy, not comercial driven, and great reviews.