Beauxbatons: I love the uniforms a lot, but they also have a really nice location. They teach classes like etiquette and manners which I like, and there's a charm to the prim and proper aspect.
Durmstrang: The complete opposite of above, but they focus on DADA and dark magic in general which is really cool. It's a shame they don't allow muggleborn but I like the school anyway.
Blessed Isis: Again, awesome gender neutral uniform. They teach cool things like runes, and then have opportunities for learners over 18. Just a cool place really.