I have a question about the King James Version?

I am quite tired of reading scripture off of many "translations"... I honestly want one trustworthy and accurate translation. People tell me KJV is the one of the oldest, traditional and most trustworthy of translations, even though it may be hard to understand. I don't like these recent translations thats being "dumbed down" for "contemporary comprehension" and it sometimes leaves out important parts. I also have high respect for Jewish traditions on Scripture and the Hebrew Bible (Tanakh), so I'm wondering if KJV is biased against jewish scripture and whatever in the Old Testament of the KJV. I want to make sure, for example, if I read many psalms in the original hebrew bible (tanakh) and the same psalms in the KJV i am getting the SAME scripture. So is KJV a trustworthy bible translation? Particularly for christians who are Old testament enthusiasts reguarding Jewish scripture?