Welcome to the tanking world. =)
That said, hit is not useless, just buffs things differently, and parry-gibbing (our vernacular) is a concern, but not a huge one. It is the survival value you get from Expertise.
As for gear itemization, there is always plenty of sources of expertise and hit, and you just have to pick your sources carefully. Just because the gear is higher ilvl/GS does *not* mean it is always the best thing for you.