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I think part of the problem is you are so small and need a super beefy binding.
The Salomon STH 16 Steels are pretty much bomb proof, BUT the DIN setting are going to be way to high for your wieght.
The Marker Jester Pro might be a good option as well, it has a low DIN setting of 8.
If you are busting your brakes, they should be fine to just swap out. I'm curious to see why the shop tech said you need to bindings because your brakes broke. Most the time with a little love, bindings can be salvaged.