Looks nice. Personally I don't know I can go back to 220ppi, but if I did I would definitely pay for the touchscreen and light over the X4!

Maybe you already have this, but I'd encourage you to put a "pure" reading mode in there, with no status bars top or bottom. That would probably allow for an extra line.

I wonder if there's also room in the case spec to slot in a magnet here or there. Could make for some creative solutions for covers or stands. Personally I use a Clara BW with a folding cover-stand and it's incredibly convenient.