I might suggest, since you have access to another Mac, using your friends CD/DVD to install iLife on your Dell. Just ask him to enable DVD/CD sharing in the Sharing module of System Preferences. If you are both connected to the same domain, you should be able to see the drive on your miniMac, and install it as though it were on your computer. Maybe a little slower, but still, it's an option you may not have been aware of.
I think the better option, is the USB stick, as once you learn the technique, you will be using it in the future for many other things, and won't have to depend on your friend being available, etc.