I'm going to recommend the new king James version, or NKJV. It is a lot easier to read than the king James version but is close enough to let you get references to the king James. the biggest difficulty you'll run into is what things are translated from. KJV/ NKJV are translated from the Latin Vulgate, which is the Catholic version. Most other modern versions are translated from closer to original Greek and Aramaic texts like the dead sea scrolls. the differences are rather small, especially once you consider the compounding factor that two thousand years has on a book but they are there. These would be an important consideration if you were reading for religious reasons but not so much for you. I'd still recommend sticking to KJV or NKJV due to that fact, it has had the most impact on our literary tradition I'd also recommend picking up a study edition of whichever edition you go with, the Jeremiah study bible is a good one. Or just googling the meaning of whatever passage you're looking at, precept Austin is a great resource for looking up interpretation of passages.

Good luck with your research, and may it be of good use to you