Vic -

at least half the reason to shoot ULF is the total experience of working with the ULF camera - the giant ground glass, the two-handed focusing, etc. If you can get your hands on something bigger than 11x14, even if only for a day, try using one before you invest money in a system, to be sure you enjoy the experience. It isn't for everyone. As you said, you can always make an interneg from a smaller piece of film if you just want to print big.