If you really need unicode fonts with different anti-aliasing, maybe try TWL as a GUI library.
Can TWL do Unicode fonts? I think it can only do bitmap fonts, same as the AngelCodeFont in Slick. Of course, the bitmap font can have Unicode glyphs, but won't have combining characters or on the-fly glyph rendering.
FreeType, used in the TWL Theme Editor and the BMFont tool, usually makes for the most crisp output. AWT, used in Hiero and UnicodeFont, is usually blurry at small sizes. The BMFont tool can do supersampling, which makes for nice antialiased glyphs (via FreeType). I posted some info here