I'm in the same boat, did you have any luck finding a good mechanic. I found united fuel injection near the airport are good but pricey that's all. I don't mind paying when you get good work
If you need a diesel specialist (fuel pump recon or injector related work) there are a few around but most are pricey and get mixed reviews. If your just after your general servicing my advice would be so find a trustworthy small workshop. Where you located?