Traveller, that was always our plan too - have a slush fund of sorts to pay for things like that because we couldn't see the benefit of PHI for the little you get back. So we only have PHI because it is a corporate plan paid for by DH's work. Your kids are only little yet, so you have plenty of time in theory to save up for potential ortho work and anything else that may pop up.
Trill, which fund is that thru?