Looking for Mastering Service

I am looking for someone I can outsource our recording project to for mastering, etc.  These are recordings of our Church choir and are pretty basic - 4 mics on the choir and 2 on the piano, and for our Solo's and quartets (etc) 2 mics on the vocals and 2 on the piano, with an occasional acoustic guitar thrown in.  

I have done this in the past but my hearing is not what it used to be, and I cant say I was very good at it either.  So I am trying to find someone that can / will do this kind of work for a reasonable cost.  

Open to recommendations / offers.......