If I had a copy that made for comfortable reading, I probably never would have stopped reading the NKJV, which had been my go to version for several years. A few years ago reading red letters became very uncomfortable. (The same goes for most bright colors, such as books that have been annotated with brightly colored ink or highlighting.) Almost all NKJV editions that aren't Study Bibles are red letter. I need larger print now as well, although some large print editions are actually too large for me to read comfortably.
One big thing the KJV has going for it is the vast array of editions with so many different font sizes and typefaces, especially if you don't mind a vintage two column verse by verse (as opposed to a paragraphed) format.
I actually had two Schuyler NKJV Bibles. One was a single column with a modern typeface. My current one is the Quentel two column and it is VERY easy to read. Somewhere I seem to remember a reviewer saying that it had the largest type in a Bible not actually called a "large print" Bible. It is black letter and has no annoying other colors in it.
I had a copy of that first Schuyler NKJV, which is an enlarged version of Nelson's NKJV Single-Column. It is exquisite, to be sure, although I remember wishing that the paper were more opaque. I got rid of it for two reasons. The first was because I decided that I needed a reference edition. (That's less of an issue for me now.) The second reason was my disappointment that this text block lacks many of the NKJV marginal notes. I think it has most if not all of the textual notes in the NT, although I seem to recall noticing at least one that was missing. But it is missing a good many explanatory notes, etc. Some think that typeface is perhaps a little too "modern." (All of those are objections to the Nelson text block, which Schuyler is probably unable to modify.)
I would like to have a look at the Quentel. If it has enough spacing between the lines, and doesn't have a cramped feel like so many paragraphed text blocks do (at least to me) it might be a winner. But I hate to have to spend that kind of money just to get a Bible that I can read. (I'm in an awkward extended phase where my eyes don't focus like they used to 5-6 years ago but also I don't need bifocals yet.) Of late I've been alternating between some KJV Bibles and my NASB Single-Column Reference. If only the SCR were available in other translations!