>>87970196No plans for a deluxe omnibus version yet. There was a hardcover version of Volume 1 out a few years ago, but that was a special anniversary thing. There are also hardcovers of some particular stories, like the Cursed Earth, but as far as bang for your buck goes the Files are your best bet.
They're also all definitely worth grabbing, since you get both the large scale stories and the smaller, more routine-oriented done in ones. That said, volume 5 is particularly stacked, with both Judge Death Lives (the second Death story, which introduced the Dark Judges) and all of Block Mania/Apocalypse War. Volume 4 is also a pretty dense one, with all of Judge Child Quest and a bunch of others. Basically, it's all good.