I have the sidi crossfires, they are expensive but very good.
They have a hinge so that walking is easy and very good protection.

I learned the hard way and spent a week in hospital with a busted foot and ankle by not wearing a full on mx/enduro boot. [I had'nt planned on falling off that day]
You cant put a price on protection get the best you can.
Lower leg injuries are one of the most common.

Also the boots need to be comfortable or you will give up wearing them.
Try a few differant boots if you can.

I use the crossfires on road or off road now, my old sidi couriers feel like a pair of gym shoes now compared.