Installing through DOS will be a milllion times lower than through the CD.
Ghosting the drive would be a very quick option.
or me however, I just use a custom CD... I have a CD for each PC, all ready setup with my Login user name, the PCs Drivers, and a few apps ready to install, and it takes about 10 minutes to go from a blank HD to a setup PC ready to rumble.
Of course, there is only so far, you can take that to... Ghosting the Disk can be preferable as you can have it fully activated and have as many apps etc as you like all readily installed.