I was going to download a copy of CentOS 7 and found that there were a number of ISO’s available. At first glance I could not figure out which Centos iso i should use so I did a little digging around and came up with the following answer that may be of some use to you.

First off I went to http://mirrors.usc.edu/pub/linux/distributions/centos/7/isos/x86_64/ and they had this listed on their site:

	CentOS-7-x86_64-DVD-1511.iso	09-Dec-2015 15:15	4.0G
	CentOS-7-x86_64-DVD-1511.torrent	14-Dec-2015 06:00	162K
	CentOS-7-x86_64-Everything-1511.iso	09-Dec-2015 14:39	7.2G
	CentOS-7-x86_64-Everything-1511.torrent	14-Dec-2015 06:00	290K
	CentOS-7-x86_64-LiveGNOME-1511.iso	10-Dec-2015 04:09	1.1G
	CentOS-7-x86_64-LiveGNOME-1511.torrent	14-Dec-2015 06:00	46K
	CentOS-7-x86_64-LiveKDE-1511.iso	10-Dec-2015 04:09	1.7G
	CentOS-7-x86_64-LiveKDE-1511.torrent	14-Dec-2015 06:00	67K
	CentOS-7-x86_64-Minimal-1511.iso	09-Dec-2015 15:03	603M
	CentOS-7-x86_64-Minimal-1511.torrent	14-Dec-2015 06:00	24K
	CentOS-7-x86_64-NetInstall-1511.iso	09-Dec-2015 14:34	376M
	CentOS-7-x86_64-NetInstall-1511.torrent	14-Dec-2015 06:00	15K

Here is the break-down of how to select which CentOS ISO to use:

CentOS-7-x86_64-DVD-1511.iso
  This DVD image contains all the packages that can be installed using the
  installer. This is the recommended image for most users.

CentOS-7-x86_64-NetInstall-1511.iso
  This is the network install and rescue image. The installer will ask from 
  where it should fetch the packages to be installed. This image is most 
  useful if you have a local mirror of CentOS packages.

CentOS-7-x86_64-Everything-1511.iso
  This image contains the complete set of packages for CentOS 7. It can be 
  used for installing or populating a local mirror. This image needs a dual 
  layer DVD or an 8GB USB flash drive.

CentOS-7-x86_64-LiveGNOME-1511.iso
CentOS-7-x86_64-LiveKDE-1511.iso
  These images are Live images of CentOS 7. Depending on the name they use the
  respective display manager. They are designed for testing purposes and
  exploring the CentOS 7 environment. They will not modify the content of your 
  hard disk, unless you choose to install CentOS 7 from within the Live
  environment. Please be advised that you can not change the set of installed
  packages in this case. This needs to be done within the installed system
  using 'yum'.

CentOS-7-x86_64-Minimal-1511.iso
  The aim of this image is to install a very basic CentOS 7 system, with the 
  minimum of packages needed to have a functional system. Please burn this image
  onto a CD and boot your computer off it. A preselected set of packages will be
  installed on your system. Everything else needs to be installed using yum. The set
  of packages installed by this image is identical to the one installed when choosing
  the group named "Minimal" from the full DVD image.

Now funny enough the above information was found in the 0_README.txt file but who reads that :)