Ilford's D-76 is called ID-11.
Using that developer undiluted will result in finer-appearing grain at the expense of less perceived sharpness (acutance). Since grain is a non-issue for most large-format photography, dilution seems to make more sense to me. (I have long used diluted D-76 with 35mm film and find that the trade-off has been worthwhile; I almost always prefer image sharpness over fine grain, and simply use slower films when I want both.)
D-23 is a good developer with which to play with. Eventually you will probably want to add a second and third developer (one at a time!). One of the greatest advantages, to me, of large format photography is that you can shoot an image on several sheets of film and develop it in different developers with different times to get precisely what you want out of the image. It is far easier to tinker with possibilities with LF than it is with roll film or 35mm. One can, of course, take this to ridiculous lengths but I like the idea of shooting an image on three or four sheets of film so that I can try different possibilities a little more easily.
Stick with D-23 awhile. Learn what you love about it and what you hate about it. Once you know that, try to find a developer that will really complement it and learn how to use it (Rodinal pops into my head as a possibility, or a pyrogallol or pyrocatechin developer like PMK or Pyrocat). It is even entirely possible that you will love D-23 so much that this additional step will not be necessary.
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