If you're going for pure study, the NASB is the best Bible, period.
If you're going for ease of general readability, then the ESV is the best choice.
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KJV - if you use the search facility you will find numerous threads on this topic.
"homogenize in a church" - think this lost its meaning somewhere in the mid Atlantic!
Which version of the KJV? It's gone through at least four significant revisions (one within the lifetime of the original translators if I recall correctly), and different companies nuance the text in different ways.
Not to get off topic, but even people touted as "KJV only" icons admitted the NASB is a more literal and reliable translation of the original texts.