For reading I use the NIV but I do have a copy of the KJV and NLT to compare notes. I like looking at multiple translations because, IMO, certain translations give a passage more clarity. I would suggest a parallel Bible between the NIV and KJV. The KJV is beautiful but for me at least, a little hard to read (as was Shakespearean literature in High School!
). So for reading purposes, I like the NIV.