If you compare the NIV with the KJV you will find a lot of archaic expressions and poor English. The latter is no standard.
I would just add a little comment here, that it's fairly common in my community to hear archaic things and sometimes our speech fits more with the KJV than other areas of the U.S. So it's not totally archaic throughout the U.S, although even here it's 'mostly' archaic.
You said that if the choice was between the KJVO and the NIV you'd pick the KJVO pastor. What notable passages would you cite in which the message and meaning of the NIV is so radically different than that of the KJV? If you can't think of any than you are just blowing smoke.
(I added the correction you mentioned into the quote here in red, just so you/others don't think I misquoted you
)
My complaint against most of the modern translations isn't necessarily that the meaning of a passage is going to be radically changed, so much as it's going to be watered down.
For example, I prefer the word "Conversation" in the KJV to the word "Conduct" in the NIV in 1 Timothy 4:12. "Conversation" has an all-pervasive kind of definition whereas conduct seems limited to a "behavior" definition. The ESV and NKJV also use conduct in this verse, but are overall more precise than the NIV when I read them.
In other words, older English was much more expressive and precise whereas newer English is less expressive, and less precise. I have this exact same issue with modern Christian music where the current mainstream English dialect often falls short of precision.
There's also the issue of 1 Corinthians 6:9 in the KJV vs NIV. The KJV is quite clear on the list of sin there. The NIV groups it all up as "immoral". For obvious reasons I'm not going to discuss this in too much depth, but there are other verses in scripture where such behavior is explicitly mentioned and castigated in the KJV whereas the NIV does not seem to take as much of a hardline stance.
Another thing I had mentioned in the OP, are you comfortable with a pastor denouncing other Bible versions when he is supposed to be driven to the text and delivering a faithful message to believers?
In some cases yes. I am fine with him denouncing the gender neutral versions and any other liberal versions. I am fine with him denouncing the Message Bible as well, or Roman Catholic Bible versions. I am fine with him denouncing the NIV for the lack of precision.
I would not be ok with him denouncing other versions that I would rate as "more solid" such as NKJV, ESV, NASB, etc.