As most computers come with Nero nowadays (at least, in Europe that is), why not use the Nero image recorder? Just make your compilation like you are used to do, but instead of using your CD/DVD burner, select the Nero image recorder. Once you start burning, Nero asks what destination to write to. Be sure to select .ISO format, give it a name and location and start "burning".
Great thing is that it doesn't require any addidional software if you already have Nero installed.