Another vote for the Crown. It's perfect for easy travelling, and about as light and easy to carry as you're going to find in 4x5.

I made 2 trips to China schlepping mine around, so it's hard-won wisdom. I also just picked up a 90mm lens on a Crown board for it, so you have choice in lenses too. Another added bonus is price -- they're not expensive and film holders are equally plentiful and cheap.