An old Linhof Color, if you can find one.
A really basic, rugged, light monorail which can also be used outdoors. I put mine in a Lowepro S&F Rover Lite, along with 5 lenses or so for landscapes. I do 99% field work...

Spend money on lenses. Good shutters are more important than good optics. Spend the rest of your money on film