Over the years I have used different translations for different occasions. I have preached out of the KJV mostly. When I preached in a church that were baby Christians and needed milk, I used the NIV. I don't remember using the NKJV although my Baptist Pastor uses the NKJV for all his sermons and Bible studies. I don't object and sometimes I even take my NKJV study Bible by John MacArthur.
I have done a lot of research over the years on the KJV, David W. Cloud, a KJVonly has written many books backing up his views, I have three of them and I must say, they are very good for those who adhere to the KJV only.
Which version others use is there own preference. I don't think we should think any less of a person that uses a translation other than the KJV. I say Bravo, If you understand and benefit from that translation, good for you, keep studying and don't listen to the critics. We should beware of the so called bibles that are authored by individuals because their interpretations my not be truly biblical.
So, pick up your Bible and study, study, study, without realizing it, your life will change. When you look back over even a short period of time, you'll see some of your thinking, attitudes and actions have changed without you even trying to change. This is the amazing work of God's Word which is alive!