I use spartacus (L)+8a(L) for osseocullum and Polaris (L) for Itumatrox and Gremlin+5a for Furor, But Furor suscks, Loot sucks I will never visit Tresuresure Island Again. I preferr The cold continent with Phasm, Chomper and of course to the far North the mighty and Furious All time biggest winning mob of all time the one and only OSSI
I use Expedition too, with some 5B's slapped over it.
Overall protection is decent for mining (I mostly do that) and yeah, the repair bill is very low.
I have a set of Knight also, kept away in storage for the ocasional trox hunt (evidently plated with the same trusty 5B's).