Roguelikes with best UIs

Hello all. I'm working on a roguelike and looking for a some UI inspiration. Which roguelikes (major or minor) do you think have the best UIs? And if you can spare the extra words, what in particular do you like about the UI? Thanks!

EDIT: I mostly mean in regard to menus, interface, conveying information to the player... Not so much tiles or graphics (but if you know of something amazing in this regard too, please share!)

EDIT 2: Wow - thanks, all! Lots of good information here. Time to start feeling intimidated by all the things I need to take into account for a good UI.