Here is your answer in case you don't want to read all the stuff below - DriverPacks BASE SAD feature.
The best solution is RogueSpears AutoImage which will allow you to do a RIS install.
That eliminates the CD and related space issues altogether.
Batch scripting software installs is effective but clumsy, I would suggest you take a look at Windows Post Installer (WPI).
Since you already have the switches required to automate the install, adding them to the interface would be a breeze.
It is a ery powerful tool that allows multiple configurations, will auto continue if a reboot is required and is just pretty darned slick.
DriverPacks BASE has a feature called SAD (Stand Alone Drivers) this feature will allow you to create either a network repository or a CD with all of the DriverPacks. That will cure your driver issues, however I would like to point out if you used RIS with DriverPacks then your drivers would simply be installed with the OS an eliminate the need to use SAD.
I personaly carry a DVD and a USB to IDE converter. You can either hang a DVD on the machine (It is always a good idea to open the case so you can verify that the CPU fan has not become a dust bunny nest.
) or use the USB option if the box supports boot to usb. a DVD is 20 dollars and a USB to IDE is even less. 
The RVMIntegrator and nLite can both add IE to your install quite easily. There are several IE7 AddOns for RVMI and many RVMI addons can be added with nLite.